Fifth power (algebra)

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In arithmetic and algebra, the fifth power or sursolid[1] of a number n is the result of multiplying five instances of n together:

n5 = n × n × n × n × n.

Fifth powers are also formed by multiplying a number by its fourth power, or the square of a number by its cube.

The sequence of fifth powers of integers is:

0, 1, 32, 243, 1024, 3125, 7776, 16807, 32768, 59049, 100000, 161051, 248832, 371293, 537824, 759375, 1048576, 1419857, 1889568, 2476099, 3200000, 4084101, 5153632, 6436343, 7962624, 9765625, ... (sequence A000584 in the OEIS)

Properties

For any integer n, the last decimal digit of n5 is the same as the last (decimal) digit of n, i.e.

By the

quintic equation, sextic equation, and septic equation
.

Along with the fourth power, the fifth power is one of two powers k that can be expressed as the sum of k − 1 other k-th powers, providing counterexamples to Euler's sum of powers conjecture. Specifically,

275 + 845 + 1105 + 1335 = 1445 (Lander & Parkin, 1966)[2]

See also

Footnotes

  1. ^ "Webster's 1913".
  2. .

References