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A055695 Numbers k such that 12^k == -1 (mod k-1). 3
2, 6, 30, 146, 42486, 102966, 597198, 2847366, 7998606, 13133666, 30478158, 67622310, 74476206, 101258190, 105161166, 106364286, 187605438, 230000550, 242915166, 401913582, 406756350, 444314574, 848205078, 899715894, 1508418054, 1575220350, 1578086334, 1691859102 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

MATHEMATICA

Do[If[PowerMod[12, n, n-1]==n-2, Print[n]], {n, 2, 10^8}]

CROSSREFS

Sequence in context: A295863 A224530 A120950 * A113593 A122763 A166078

Adjacent sequences:  A055692 A055693 A055694 * A055696 A055697 A055698

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jun 09 2000

EXTENSIONS

Terms a(14) onward from Max Alekseyev, Oct 12 2012

STATUS

approved

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Last modified May 24 21:58 EDT 2022. Contains 354043 sequences. (Running on oeis4.)