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A055686 Numbers k such that 3^k == -1 (mod k-1). 4
2, 3, 5, 6, 15, 245, 366, 435, 855, 2295, 3795, 5967, 7875, 10878, 26475, 33915, 117615, 188775, 231435, 284355, 487635, 501039, 589155, 593775, 621675, 755595, 1255815, 1306935, 1642095, 1911195, 2193125, 2434755, 2484675, 2507835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..1000

MATHEMATICA

Do[If[PowerMod[3, n, n-1]==n-2, Print[n]], {n, 2, 10^7}]

CROSSREFS

Cf. A055685, A055687, A055688, A055689, A055690, A055691, A055692, A055693, A055694, A055695.

Sequence in context: A222313 A355483 A079226 * A126250 A293027 A276353

Adjacent sequences:  A055683 A055684 A055685 * A055687 A055688 A055689

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jun 09 2000

STATUS

approved

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Last modified September 25 17:17 EDT 2022. Contains 356986 sequences. (Running on oeis4.)