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A177912
Numbers k such that k^3 divides 12^(k^2) - 1.
15
1, 11, 253, 11891, 77209, 768361, 1775807, 17666737, 36112967, 61488361, 83462929, 154261943, 173185331, 591303757, 830336639, 971656873, 2936791979, 4139054953, 5393125859, 8139710557, 8142849781, 45667873031, 53653880269
OFFSET
1,2
COMMENTS
11 divides a(n) for n > 1.
MATHEMATICA
Join[{1}, Select[Range[3000000], PowerMod[12, #^2, #^3] == 1 &]] (* Robert Price, Mar 31 2020 *)
CROSSREFS
Cf. A014951 (k divides 12^k-1), A128405 (k^2 divides 12^k-1).
Sequence in context: A009067 A128683 A292335 * A128405 A377426 A052782
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, May 14 2010
EXTENSIONS
More terms from Max Alekseyev, Oct 02 2010
STATUS
approved