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A177807
Numbers k that divide 17^k - 1.
6
1, 2, 4, 6, 8, 12, 16, 18, 20, 24, 32, 36, 40, 42, 48, 54, 60, 64, 72, 78, 80, 84, 96, 100, 108, 116, 120, 126, 128, 144, 156, 160, 162, 168, 180, 192, 200, 216, 220, 232, 234, 240, 252, 256, 288, 294, 300, 312, 320, 324, 336, 342, 348, 360, 378, 384, 400, 420
OFFSET
1,2
MATHEMATICA
{1}~Join~Select[Range[420], PowerMod[17, #, #] == 1 &] (* Giovanni Resta, Jan 30 2020 *)
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, May 17 2010
STATUS
approved