183 (number)

← 182 183 184 →
100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred eighty-three
Ordinal	183rd (one hundred eighty-third)
Factorization	3 × 61
Divisors	1, 3, 61, 183
Greek numeral	ΡΠΓ´
Roman numeral	CLXXXIII
Binary	101101112
Ternary	202103
Senary	5036
Octal	2678
Duodecimal	13312
Hexadecimal	B716

183 (one hundred [and] eighty-three) is the natural number following 182 and preceding 184.

In mathematics

183 is a perfect totient number, a number that is equal to the sum of its iterated totients.^[1]

Because ${\displaystyle 183=13^{2}+13+1}$, it is the number of points in a projective plane over the finite field ${\displaystyle \mathbb {Z} _{13}}$.^[2] 183 is the fourth element of a divisibility sequence ${\displaystyle 1,3,13,183,\dots }$ in which the ${\displaystyle n}$th number ${\displaystyle a_{n}}$ can be computed as

for a transcendental number ${\displaystyle x\approx 1.38509}$.^[3][4] This sequence counts the number of trees of height ${\displaystyle \leq n}$ in which each node can have at most two children.^[3][5]

There are 183 different semiorders on four labeled elements.^[6]

See also

• The year AD 183 or 183 BC
• List of highways numbered 183
• All pages with titles containing 183

References

Wikimedia Commons has media related to 183 (number).