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A177917
Numbers k such that k^3 divides 17^(k^2) - 1.
17
1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 24, 30, 36, 40, 42, 48, 58, 60, 72, 78, 80, 84, 90, 110, 114, 116, 120, 126, 144, 156, 168, 174, 180, 210, 220, 222, 228, 232, 234, 240, 252, 290, 312, 330, 336, 342, 348, 360, 390, 420, 440, 444, 456, 464, 468, 504, 522, 546
OFFSET
1,2
COMMENTS
The first 9 terms (and others) of A218087 are in this sequence A177917 as well as in A128397. These two sequences have many terms in common, but A177917 \ A128397 = {10, 30, 58, 90, 110, ...} and A128397 \ A177917 = {580, 624, 660, 684, 696, 720, ...}. - M. F. Hasler, Oct 22 2012
LINKS
MATHEMATICA
Select[Range[600], Divisible[17^#^2-1, #^3]&] (* Harvey P. Dale, Jul 19 2015 *)
PROG
(PARI) is_A177917(n)=Mod(17, n^3)^(n^2)==1 \\ M. F. Hasler, Oct 21 2012
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, May 14 2010
STATUS
approved