6

← 5 6 7 →
Hebrew		ו
Khmer	៦
Thai	๖
Telugu	౬
Tamil	௬
Saraiki	٦
Malayalam	൬
Armenian	Զ
Babylonian numeral	𒐚
Egyptian hieroglyph	𓏿
Morse code	_ ....

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.^[1]

In mathematics

Six is the smallest positive integer which is neither a

6 is a

which makes it the first member of the (2 × q) discrete biprime family, where q is a higher prime. All primes above 3 are of the form 6n ± 1 for n ≥ 1.

As a perfect number:

• 6 is related to the Mersenne prime 3, since 2¹(2² – 1) = 6. (The next perfect number is 28.)
• 6 is the only even perfect number that is not the sum of successive odd cubes.^[6]
• 6 is the root of the 6-aliquot tree, and is itself the aliquot sum of only one other number; the square number, 25.

Six is the first unitary perfect number, since it is the sum of its positive proper unitary divisors, without including itself. Only five such numbers are known to exist; sixty (10 × 6) and ninety (15 × 6) are the next two.^[7]

It is the first primitive

and all integers ${\displaystyle n}$ that are multiples of 6 are pseudoperfect (all multiples of a perfect number are pseudoperfect); six is also the smallest Granville number, or ${\displaystyle {\mathcal {S}}}$-perfect number.^[9]

Unrelated to 6's being a perfect number, a Golomb ruler of length 6 is a "perfect ruler".^[10] Six is a congruent number.^[11]

6 is the second primary pseudoperfect number,^[12] and harmonic divisor number.^[13] It is also the second superior highly composite number,^[14] and the last to also be a primorial.

There are 6 non-equivalent ways in which 100 can be expressed as the sum of two prime numbers: (3 + 97), (11 + 89), (17 + 83), (29 + 71), (41 + 59) and (47 + 53).^[15]

There is not a prime ${\displaystyle p}$ such that the multiplicative order of 2 modulo ${\displaystyle p}$ is 6, that is, ${\displaystyle ord_{p}(2)=6}$ By Zsigmondy's theorem, if ${\displaystyle n}$ is a natural number that is not 1 or 6, then there is a prime ${\displaystyle p}$ such that ${\displaystyle ord_{p}(2)=n}$. See A112927 for such ${\displaystyle p}$.

The ring of integer of the sixth cyclotomic field Q(ζ₆), which is called Eisenstein integer, has 6 units: ±1, ±ω, ±ω², where ${\displaystyle \omega ={\frac {1}{2}}(-1+i{\sqrt {3}})=e^{2\pi i/3}}$.

The six exponentials theorem guarantees (given the right conditions on the exponents) the transcendence of at least one of a set of exponentials.^[16]

There are six basic trigonometric functions: sin, cos, sec, csc, tan, and cot.^[17]

The smallest non-abelian group is the symmetric group ${\displaystyle \mathrm {S_{3}} }$ which has 3! = 6 elements.^[1]

Six is a triangular number^[18] and so is its square (36). It is the first octahedral number, preceding 19.^[19]

A six-sided

{6/2}, 2{3}, or {{3}}).

Six similar coins can be arranged around a central coin of the same radius so that each coin makes contact with the central one (and touches both its neighbors without a gap), but seven cannot be so arranged. This makes 6 the answer to the two-dimensional

touches just six others.

There is only one non-trivial

Graeco-Latin squares

with order 6 do not exist; if ${\displaystyle n}$ is a natural number that is not 2 or 6, then there is a Graeco-Latin square of order ${\displaystyle n}$.^[21]

The

symmetries).

How closely the shape of an object resembles that of a perfect sphere is called its sphericity, calculated by:^[22]

where ${\displaystyle A_{s}}$ is the surface area of the sphere, ${\displaystyle V_{p}}$ the volume of the object, and ${\displaystyle A_{p}}$ the surface area of the object.

In

.

${\displaystyle \mathrm {S_{6}} }$, with 720 = 6

Hoffman-Singleton graph

. A closely related result is the following theorem: 6 is the only natural number ${\displaystyle n}$ for which there is a construction of ${\displaystyle n}$

isomorphic

objects on an ${\displaystyle n}$-set ${\displaystyle A}$, invariant under all permutations of ${\displaystyle A}$, but not naturally in with the elements of ${\displaystyle A}$. This can also be expressed category theoretically: consider the category whose objects are the ${\displaystyle n}$ element sets and whose arrows are the bijections between the sets. This category has a non-trivial functor to itself only for ${\displaystyle n=6}$.

In the classification of finite simple groups, twenty of twenty-six sporadic groups in the happy family are part of three families of groups which divide the order of the friendly giant, the largest sporadic group: five first generation Mathieu groups, seven second generation subquotients of the Leech lattice, and eight third generation subgroups of the friendly giant. The remaining six sporadic groups do not divide the order of the friendly giant, which are termed the pariahs (Ly, O'N, Ru, J₄, J₃, and J₁).^[23]

List of basic calculations

Multiplication	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	25	50	100	1000
6 × x	6	12	18	24	30	36	42	48	54	60	66	72	78	84	90	96	102	108	114	120	150	300	600	6000

Division	1	2	3	4	5	6	7	8	9	10		11	12	13	14	15
6 ÷ x	6	3	2	1.5	1.2	1	0.857142	0.75	0.6	0.6		0.54	0.5	0.461538	0.428571	0.4
x ÷ 6	0.16	0.3	0.5	0.6	0.83	1	1.16	1.3	1.5	1.6		1.83	2	2.16	2.3	2.5

Exponentiation	1	2	3	4	5	6	7	8	9	10		11	12	13
6x	6	36	216	1296	7776	46656	279936	1679616	10077696	60466176		362797056	2176782336	13060694016
x6	1	64	729	4096	15625	46656	117649	262144	531441	1000000		1771561	2985984	4826809

Greek and Latin word parts

Hexa

Hexa is classical Greek for "six".^[1] Thus:

• "
  number base of 16^[24]
• A hexagon is a regular polygon with six sides^[25]
  • L'Hexagone is a French nickname for the continental part of Metropolitan France for its resemblance to a regular hexagon
• A
  cube being a special case^[26]
• Hexameter is a poetic form consisting of six feet per line
• A "hex nut" is a nut with six sides, and a hex bolt has a six-sided head
• The prefix "hexa-" also occurs in the systematic name of many chemical compounds, such as hexane which has 6 carbon atoms (C₆H₁₄).

The prefix sex-

Sex- is a

Thus:

• Senary is the ordinal adjective meaning "sixth"[27]
• People with
  sexdactyly
  have six fingers on each hand
• The measuring instrument called a sextant got its name because its shape forms one-sixth of a whole circle
• A group of six musicians is called a sextet
• Six babies delivered in one birth are
  sextuplets
• Sexy prime pairs – Prime pairs differing by six are sexy, because sex is the Latin word for six.^[28][29]

The

(a).

Evolution of the Hindu-Arabic digit

Minor Rock Edict No.1 in Sasaram

, c. 250 BCE

The evolution of our modern digit 6 appears rather simple when compared with the other digits. The modern 6 can be traced back to the Brahmi numerals of India, which are first known from the Edicts of Ashoka c. 250 BCE.^{[30][31][32][33]} It was written in one stroke like a cursive lowercase e rotated 90 degrees clockwise. Gradually, the upper part of the stroke (above the central squiggle) became more curved, while the lower part of the stroke (below the central squiggle) became straighter. The Arabs dropped the part of the stroke below the squiggle. From there, the European evolution to our modern 6 was very straightforward, aside from a flirtation with a glyph that looked more like an uppercase G.^[34]

On the seven-segment displays of calculators and watches, 6 is usually written with six segments. Some historical calculator models use just five segments for the 6, by omitting the top horizontal bar. This glyph variant has not caught on; for calculators that can display results in hexadecimal, a 6 that looks like a "b" is not practical.

Just as in most modern typefaces, in typefaces with text figures the character for the digit 6 usually has an ascender, as, for example, in .^[35]

This digit resembles an inverted 9. To disambiguate the two on objects and documents that can be inverted, the 6 has often been underlined, both in handwriting and on printed labels.

In music

In artists

• Les Six ("The Six" in English) was a group consisting of the French composers Georges Auric, Louis Durey, Arthur Honegger, Darius Milhaud, Francis Poulenc and Germaine Tailleferre in the 1920s^[36]
• Bands with the number six in their name include
  You Me At Six^[41]
• #6 is the pseudonym of American musician Shawn Crahan, when performing with the band Slipknot

In instruments

• A standard guitar has six strings^[42]
• Most
  woodwind
  instruments have six basic holes or keys (e.g., bassoon, clarinet, pennywhistle, saxophone); these holes or keys are usually not given numbers or letters in the fingering charts

In music theory

• There are six whole tones in an octave.^[43]
• There are six semitones in a tritone.^[44]

In works

• "Six geese a-laying" were given as a present on the sixth day in the popular Christmas carol, "The Twelve Days of Christmas".^[45]
• Divided in six arias, Hexachordum Apollinis is generally regarded as one of the pinnacles of Johann Pachelbel's oeuvre.^[46]
• The theme of the sixth album by Dream Theater, Six Degrees of Inner Turbulence, was the number six: the album has six songs, and the sixth song—that is, the complete second disc—explores the stories of six individuals suffering from various mental illnesses.^[47]
• Mythos.^[48]

In religion

Judaism

• Six points on a Star of David^[49]
• Six orders of the Mishnah^[50]
• Six symbolic foods placed on the
  Passover Seder Plate^[51]
• City of God, Augustine of Hippo suggested (book 11, chapter 30) that God's creation of the world took six days because 6 is a perfect number.^[53]
• The Jewish holiday of Shavuot starts on the sixth day of the Hebrew month of Sivan^[54]
• Seraphs have six wings.^[55]

Islam

• There are Six articles of faith^[56]
• Six points on a Seal of Solomon
• Fasting six days of Shawwal, together with the month of Ramadan, is equivalent to fasting the whole year^[57]
• The heavens and earth were created in six days according to the Quran:^[58]

Indeed, We created the heavens and the earth and everything in between in six Days,¹ and We were not ˹even˺ touched with fatigue.²

— Surah Qaf:38

Note 1: The word day is not always used in the Quran to mean a 24-hour period. According to Surah Al-Hajj (The Pilgrimage):47, a heavenly Day is 1000 years of our time. The Day of Judgment will be 50,000 years of our time - Surah Al-Maarij (The Ascending Stairways):4. Hence, the six Days of creation refer to six eons of time, known only by Allah.

Note 2: Some Islamic scholars believe this verse comes in response to Exodus 31:17, which says, "The Lord made the heavens and the earth in six days, but on the seventh day He rested and was refreshed."

Others

• In
  trasarenu is the combination of six celestial paramānus (atoms
  ).
• In Taoism:
  • Six Lines of a Hexagram
  • Six Ministries of Huang Di^[59]

In science

Astronomy

• M6, a magnitude 4.5 open cluster in the constellation Scorpius, also known as the Butterfly Cluster^[60]
• The
  Andromeda
• The Roman numeral VI:
  • Stands for subdwarfs in the Yerkes spectral classification scheme
  • (Usually) stands for the sixth-discovered satellite of a planet or minor planet (e.g.
    Jupiter VI
    )
• 6 Hebe

Biology

• The cells of a beehive are six-sided.^[61]
• Insects have six legs (see Hexapoda).^[62]
• Six kingdoms in the
  Eubacteria. See Kingdom (biology).^[63]
• The six elements most common in biomolecules are called the CHNOPS elements; the letters stand for the chemical abbreviations of
  CHON.^[64]

Chemistry

• A benzene molecule has a ring of six carbon atoms.^[65]
• 6 is the atomic number of carbon.^[66]
• The sixfold symmetry of snowflakes arises from the hexagonal crystal structure of ordinary ice.^[67]
• A
  hexamer
  is an oligomer made of six subunits.

Medicine

• There are six tastes in traditional Indian medicine (Ayurveda): sweet, sour, salty, bitter, pungent, and astringent. These tastes are used to suggest a diet based on the symptoms of the body.^[68]
• Phase 6 is one of six
  pandemic influenza phases.^[69]

Physics

• In the Standard Model of particle physics, there are six types of
  leptons.^[70]
• In statistical mechanics, the six-vertex model has six possible configurations of arrows at each vertex^[71]
• There are six colors in the RGB color wheel: (primary) red, blue, green, (secondary) cyan, magenta, and yellow. (See
  Tertiary color)^[72]
• In
  planes
  .

In sports

• The Original Six teams in the National Hockey League are Toronto, Chicago, Montreal, New York, Boston, and Detroit.^[73] They are the oldest remaining teams in the league, though not necessarily the first six; they comprised the entire league from 1942 to 1967.
• Number of players:
  • In association football (soccer), the number of substitutes combined by both teams, that are allowed in the game.
  • In box lacrosse, the number of players per team, including the goaltender, that are on the floor at any one time, excluding penalty situations.^[74]
  • In ice hockey, the number of players per team, including the goaltender, that are on the ice at any one time during regulation play, excluding penalty situations. (Some leagues reduce the number of players on the ice during overtime.)^[75]
  • In volleyball:
    • Six players from each team on each side play against each other.^[76]
    • Standard rules only allow six total substitutions per team per set. (Substitutions involving the libero, a defensive specialist who can only play in the back row, are not counted against this limit.)
  • Six-man football is a variant of American or Canadian football, played by smaller schools with insufficient enrollment to field the traditional 11-man (American) or 12-man (Canadian) squad.^[77]
• Scoring:
  • In both American and Canadian football, 6 points are awarded for a touchdown.^[78]
  • In Australian rules football, six points are awarded for a goal, scored when a kicked ball passes between the defending team's two inner goalposts without having been touched by another player.
  • In
    six runs
    are scored for the batting team when the ball is hit to the boundary or the ground beyond it without having touched the ground in the field.
• In basketball, the ball used for women's full-court competitions is designated "size 6".^[79]
• In pool and snooker one its table contains six pockets.
• In most rugby league competitions (but not the Super League, which uses static squad numbering), the jersey number 6 is worn by the starting five-eighth (Southern Hemisphere term) or stand-off (Northern Hemisphere term).
• In rugby union, the starting blindside flanker wears jersey number 6. (Some teams use "left" and "right" flankers instead of "openside" and "blindside", with 6 being worn by the starting left flanker.)^[80]

In technology

• On most phones, the 6 key is associated with the letters
  Curve 8900 with full keyboard, it is the key for F
• The "6-meter band" in amateur radio includes the frequencies from 50 to 54 MHz
• 6 is the resin identification code used in recycling to identify polystyrene^[81]

In calendars

• In the ancient Roman calendar, Sextilis was the sixth month. After the Julian reform, June became the sixth month and Sextilis was renamed August^[82]
• Sextidi was the sixth day of the
  French Revolutionary calendar^[83]

In the arts and entertainment

Games

• The number of sides on a cube, hence the highest number on a standard die^[84]
• The six-sided tiles on a hex grid are used in many tabletop and
  board games
  .
• The highest number on one end of a standard domino

Comics and cartoons

• The Super 6, a 1966 animated cartoon series featuring six different super-powered heroes.^[85]

Literature

• The Power of Six is a book written by Pittacus Lore, and the second in the Lorien Legacies series.^[86]
• Number 6 is a character in the book series Lorien Legacies.

TV

• Number Six (Tricia Helfer) is a family of fictional characters from the reimagined science fiction television series, Battlestar Galactica.
• Number 6, the main protagonist in The Prisoner played by Patrick McGoohan, and portrayed by Jim Caviezel in the remake.
• Six is a character in the television series Blossom played by Jenna von Oÿ.^[87]
• Six is the nickname of Kal Varrik, a central character in the television series Dark Matter, played by Roger Cross.^[88]
• History channel series that chronicles the operations and daily lives of SEAL Team Six.^[89]
• Six Feet Under, an HBO series that ran from 2005 to 2011.^[90]

Movies

• Number 6 (Teresa Palmer) is a character in the movie I Am Number Four (2011).^[91]
• The 6th Day (2000), starring Arnold Schwarzenegger.^[92]
• The Sixth Sense (1999), written and directed by M. Night Shyamalan and starring Haley Joel Osment and Bruce Willis.^[93]
• Girl 6 (1996), directed by Spike Lee.^[94]

Musicals

• Six is a modern retelling of the lives of the six wives of Henry VIII presented as a pop concert.^[95]

Anthropology

• The name of the smallest group of
  Brownies
  , traditionally consisting of six people and is led by a "sixer".
• A coffin is traditionally buried six feet under the ground; thus, the phrase "six feet under" means that a person (or thing, or concept) is dead^[96]
• There are said to be no more than six degrees of separation between any two people on Earth.^[97]
• In Western astrology, Virgo is the 6th astrological sign of the Zodiac^[98]
• The Six Dynasties form part of Chinese history^[99]
• Six is a lucky
  number in Chinese culture.^[100]
• The Birmingham Six were a British miscarriage of justice, held in prison for 16 years.^[101]
• "Six" is used as an informal slang term for the British
  Secret Intelligence Service, MI6.^[102]

In other fields

• Six-pack is a common form of packaging for six bottles or cans of drink (especially beer), and by extension, other assemblages of six items.^[103] Also, six is half a dozen.
• The maximum number of dots in a braille cell.^[104]
• Extrasensory perception is sometimes called the "sixth sense".^[105]
• Six Flags is an American company running amusement parks and theme parks in the U.S., Canada, and Mexico.^[106]
• In the
  U.S. Army "Six" as part of a radio call sign is used by the commanding officer of a unit, while subordinate platoon leaders usually go by "One".^[107] (For a similar example see also: Rainbow Six
  .)

See also

• List of highways numbered 6
• Six degrees (disambiguation).

References

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3. ^ Weisstein, Eric W. "Harshad Number". mathworld.wolfram.com. Retrieved 2020-08-03.
4. ^ "Sloane's A002378: Pronic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2020-11-30.
5. ^ Sloane, N. J. A. (ed.). "Sequence A001358 (Semiprimes (or biprimes): products of two primes.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-08-03.
6. ^ David Wells, The Penguin Dictionary of Curious and Interesting Numbers. London: Penguin Books (1987): 67
7. ^ Sloane, N. J. A. (ed.). "Sequence A002827 (Unitary perfect numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-01.
8. ^ Sloane, N. J. A. (ed.). "Sequence A005835 (Pseudoperfect (or semiperfect) numbers n: some subset of the proper divisors of n sums to n.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-12-02.
9. ^ "Granville number". OeisWiki. The Online Encyclopedia of Integer Sequences. Archived from the original on 29 March 2011. Retrieved 27 March 2011.
10. ^ Bryan Bunch, The Kingdom of Infinite Number. New York: W. H. Freeman & Company (2000): 72
11. ^ Sloane, N. J. A. (ed.). "Sequence A003273 (Congruent numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-01.
12. ^ Sloane, N. J. A. (ed.). "Sequence A054377 (Primary pseudoperfect numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2018-11-02.
13. ^ Sloane, N. J. A. (ed.). "Sequence A001599 (Harmonic or Ore numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-01.
14. ^ Weisstein, Eric W. "Superior Highly Composite Number". mathworld.wolfram.com. Retrieved 2020-08-03.
15. ^ Sloane, N. J. A. (ed.). "Sequence A065577 (Number of Goldbach partitions of 10^n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-08-31.
16. ^ Weisstein, Eric W. "Six Exponentials Theorem". mathworld.wolfram.com. Retrieved 2020-08-03.
17. ^ Weisstein, Eric W. "Trigonometric Functions". mathworld.wolfram.com. Retrieved 2020-08-03.
18. ^ Weisstein, Eric W. "Triangular Number". mathworld.wolfram.com. Retrieved 2020-08-03.
19. ^ Sloane, N. J. A. (ed.). "Sequence A005900 (Octahedral numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-01.
20. ^ Weisstein, Eric W. "Kissing Number". mathworld.wolfram.com. Retrieved 2020-08-03.
21. ^ Weisstein, Eric W. "Euler's Graeco-Roman Squares Conjecture". mathworld.wolfram.com. Retrieved 2020-08-03.
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26. ^ Weisstein, Eric W. "Hexahedron". mathworld.wolfram.com. Retrieved 2020-08-03.
27. ^ Weisstein, Eric W. "Base". mathworld.wolfram.com. Retrieved 2020-08-03.
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29. ^ Weisstein, Eric W. "Sexy Primes". mathworld.wolfram.com. Retrieved 2020-08-03.
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33. ISBN 978-0-88385-540-9
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34. ^ Georges Ifrah, The Universal History of Numbers: From Prehistory to the Invention of the Computer transl. David Bellos et al. London: The Harvill Press (1998): 395, Fig. 24.66
35. ISBN 978-0-442-26696-7
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36. ISBN 978-0-486-49340-4
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37. ^ "Six Organs of Admittance". www.sixorgans.com. Retrieved 2020-08-03.
38. ^ "Electric Six | Biography, Albums, Streaming Links". AllMusic. Retrieved 2020-08-03.
39. ^ "Sixpence None The Richer". GRAMMY.com. 2020-05-19. Retrieved 2020-08-04.
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42. ^ "Definition of GUITAR". www.merriam-webster.com. Retrieved 2020-08-04.
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    . The division of an octave into six equal parts is referred to as the whole-tone scale
44. ^ Horsley, Charles Edward (1876). A Text Book of Harmony: For the Use of Schools and Students. Sampson Low, Marston, Searle, & Rivington. p. 4. Like the Tritone, it contains six semitones
45. ISBN 978-1-4027-1685-0
    . Six geese a-laying
46. ISBN 978-1-4053-8321-9
    . ...the six arias with variations collected under the title Hexachordum Apollinis (1699)...
47. ISBN 978-1-4411-1480-8
    . Six Degrees of Inner Turbulence
48. ISBN 978-1-317-67706-2
    . THE SIX QUALITATIVE ELEMENTS OF TRAGEDY
49. ISBN 978-0-910250-16-0
    . How the Six-pointed Star Became an Emblem for the Jewish People
50. ^ Lauterbach, Jacob Zallel (1916). Midrash and Mishnah: A Study in the Early History of the Halakah. Bloch. p. 9. Six orders of Mishnah
51. ISBN 978-1-57567-480-3
    . Six symbolic foods
52. ISBN 978-0-7867-4399-5
    . it actually took only six days to create the earth
53. ^ "CHURCH FATHERS: City of God, Book XI (St. Augustine)". www.newadvent.org. Retrieved 2020-08-04. These works are recorded to have been completed in six days (the same day being six times repeated), because six is a perfect number
54. ^ Grossman, Grace Cohen; Ahlborn, Richard E.; Institution, Smithsonian (1997). Judaica at the Smithsonian: Cultural Politics as Cultural Model. Smithsonian Institution Press. p. 228. Shavuot falls on the sixth day of the Hebrew month of Sivan
55. ^ Robertson, William Archibald Scott (1880). The crypt of Canterbury cathedral; its architecture, its history, and its frescoes. Mitchell & Hughes. p. 91. ...but seraphs, with six wings
56. ISBN 978-1-4358-5283-9
    . Islam has six articles of faith
57. ISBN 978-1-932099-93-5
    . ...it was blessed to fast for six days in the month of Shawwal...
58. ^ "Surah Qaf - 38". Quran.com. Retrieved 2023-08-28.
59. ISBN 978-0-231-11270-3
    . ...and the Six Ministries were made...
60. ISBN 978-0-930897-93-2
    . Three Messier objects are visible in this part of the sky : M6, M7 and M8 .
61. ISBN 978-1-4299-7634-3
    . The cells of honeycombs are six-sided because a hexagon is the most material-efficient tessellation
62. ISBN 978-0-7565-1250-7
    . Insects have six legs each...
63. ISBN 978-1-61731-899-3
    . ...presently at least six kingdoms are recognized;
64. ISBN 978-0-07-291934-9
    . The acronym CHNOPS helps us remember these six elements
65. ^ Dufour, Fritz (2018-09-19). The Realities of Reality - Part II: Making Sense of Why Modern Science Advances. Vol. 1. Fritz Dufour. p. 100. The benzene molecule has its six carbon atoms in a ring^{[self-published source?]}
66. ISBN 978-1-133-36536-5
    . For example, the atomic number of carbon is 6,
67. ISBN 978-0-387-02930-6
    . snowflake, with its familiar sixfold rotational symmetry
68. ISBN 978-0-8036-4581-3
    . Ayurvedic herbology is based on the tridoshic theory that there exist six basic tastes
69. ^ Pandemic Influenza Preparedness and Response Guidance for Healthcare Workers and Healthcare Employers. OSHA, U.S. Department of Labor. 2007. p. 8. The WHO Plan describes six phases of increasing public health risk associated with the emergence of a new influenza
70. ISBN 978-0-470-92269-9
    . ...there are six types of quarks and six types of leptons.
71. ISBN 978-0-12-385342-4
    . Allowed configurations in the six-vertex model and their statistical weights
72. ISBN 978-1-4665-9820-1
    . placing six primaries around the wheel in the following order: red, yellow, green, cyan, blue, magenta.
73. ISBN 978-1-63319-638-4
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• The Odd Number 6, JA Todd, Math. Proc. Camb. Phil. Soc. 41 (1945) 66–68
• A Property of the Number Six, Chapter 6, P Cameron, JH v. Lint, Designs, Graphs, Codes and their Links
  ISBN 0-521-42385-6
• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 67 - 69

External links

Look up six in Wiktionary, the free dictionary.

• The Number 6
• The Positive Integer 6
• Prime curiosities: 6