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A175168 Numbers n such that 2^(n-1) mod n is a prime number. 2
6, 10, 14, 22, 26, 27, 30, 34, 38, 45, 46, 58, 62, 74, 82, 86, 94, 106, 118, 122, 134, 142, 146, 153, 155, 158, 166, 170, 178, 182, 189, 194, 202, 206, 214, 215, 218, 226, 231, 254, 262, 274, 278, 287, 297, 298, 302, 314, 323 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that A062173(n) is prime.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

A062173(a(n))=A000040(k).

MATHEMATICA

Select[Range[323], PrimeQ[Mod[2^(#-1), #]] &]

Select[Range[350], PrimeQ[PowerMod[2, #-1, #]]&] (* Harvey P. Dale, Jun 07 2016 *)

CROSSREFS

Cf. A000040, A062173.

Sequence in context: A315231 A015812 A315232 * A315233 A315234 A315235

Adjacent sequences:  A175165 A175166 A175167 * A175169 A175170 A175171

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Dec 02 2010

STATUS

approved

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Last modified October 17 17:21 EDT 2021. Contains 348065 sequences. (Running on oeis4.)