A129496 - OEIS

A129496

Composite numbers k such that 6^k (mod k) is a power of 6 greater than 1.

10, 15, 21, 30, 35, 38, 42, 45, 46, 58, 60, 62, 70, 74, 82, 84, 86, 90, 94, 105, 106, 118, 122, 126, 132, 134, 140, 142, 146, 158, 166, 178, 180, 182, 185, 190, 194, 202, 206, 210, 214, 215, 217, 218, 219, 222, 226, 228, 231, 237, 249, 252, 254, 258, 259, 262

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

38 is a member of the sequence since 6^38 (mod 38) == 36.

MATHEMATICA

Select[Range@ 266, (p = PowerMod[6, #, #]) > 1 && IntegerQ@ Log[6, p] && CompositeQ[#] &] (* corrected by Amiram Eldar, Jul 24 2021 *)

CROSSREFS

Cf. A036236, A129492, A129493, A129494, A129495, A129497.

Sequence in context: A322045 A062691 A257630 * A075520 A030663 A013638

Adjacent sequences: A129493 A129494 A129495 * A129497 A129498 A129499

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Apr 17 2007

STATUS

approved