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 A081764 Primes p such that p*(p-2) divides 3^(p-1)-1. 1
 37, 457, 1297, 2557, 4357, 6481, 8689, 11953, 14401, 26497, 33931, 44101, 47521, 47881, 90631, 141157, 157081, 165601, 206221, 225457, 304081, 366097, 384049, 427351, 446881, 560737, 576721, 589591, 636781, 677041, 1037857, 1046641, 1049941, 1079569 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..100 MATHEMATICA Select[Prime[Range[85000]], PowerMod[3, #-1, #(#-2)]==1&]//Quiet (* Harvey P. Dale, Mar 19 2019 *) PROG (PARI) lista(nn) = {forprime(p=3, nn, if (! ((3^(p-1)-1) % (p*(p-2))), print1(p, ", ")); ); } CROSSREFS Sequence in context: A227825 A201609 A140847 * A142567 A142286 A166132 Adjacent sequences:  A081761 A081762 A081763 * A081765 A081766 A081767 KEYWORD easy,nonn AUTHOR Benoit Cloitre, Apr 09 2003 EXTENSIONS More terms from Michel Marcus, Dec 02 2013 STATUS approved

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Last modified October 14 05:08 EDT 2019. Contains 327995 sequences. (Running on oeis4.)