OFFSET
1,1
COMMENTS
Presumably this is also Primes congruent to 1 mod 47. - N. J. A. Sloane, Jul 11 2008. Not so! The smallest counterexample is 26227: 26227 == 1 (mod 47), but 131^47 == 2 (mod 26227), therefore this prime is not in the sequence. - Bruno Berselli, Sep 12 2012
All terms are 1 mod 94. - Charles R Greathouse IV, Sep 13 2012
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
ok[p_]:= Reduce[Mod[x^47 - 2, p] == 0, x, Integers] == False; Select[Prime[Range[1800]], ok] (* Vincenzo Librandi, Sep 20 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(15000) | forall{x: x in ResidueClassRing(p) | x^47 ne 2}]; // Bruno Berselli, Sep 12 2012
(PARI) select(p->!ispower(Mod(2, p), 47), primes(3000)) \\ Charles R Greathouse IV, Sep 13 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Klaus Brockhaus, Jan 23 2001
STATUS
approved