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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
MATHEMATICA
Do[If[PowerMod[3, n, n-1]==n-2, Print[n]], {n, 2, 10^7}]
CROSSREFS
Sequence in context: A222313 A355483 A079226 * A126250 A293027 A276353
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Jun 09 2000
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)