A077255 - OEIS

A077255

Numbers k such that prime(k)^k == 1 (mod k).

2, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 24, 27, 32, 36, 40, 42, 48, 50, 52, 54, 60, 64, 70, 72, 80, 84, 96, 100, 105, 108, 110, 114, 120, 121, 124, 125, 126, 128, 136, 144, 148, 156, 160, 162, 168, 180, 181, 182, 189, 192, 200, 210, 216, 220, 231, 234, 240, 243, 246

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OFFSET

1,1

COMMENTS

Contains A023143. All terms not in A023143 are in A060679. - Robert Israel, Oct 31 2016

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

A077254(a(n)) = 1; A077256(n) = A000040(a(n)).

EXAMPLE

prime(16)^16 mod 16 = 53^16 mod 16 = 3876269050118516845397872321 mod 16 = 1, therefore 16 is a term.

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