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A040116 Primes p such that x^4 = 9 has a solution mod p. 2
2, 3, 7, 11, 13, 19, 23, 31, 37, 43, 47, 59, 61, 67, 71, 73, 79, 83, 97, 103, 107, 109, 127, 131, 139, 151, 157, 163, 167, 179, 181, 191, 193, 199, 211, 223, 227, 229, 239, 241, 251, 263, 271, 277, 283, 307, 311 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

ok [p_]:=Reduce[Mod[x^4 - 9, p]== 0, x, Integers]=!= False; Select[Prime[Range[170]], ok] (* Vincenzo Librandi, Sep 12 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(400) | exists(t){x : x in ResidueClassRing(p) | x^4 eq 9}]; // Vincenzo Librandi, Sep 12 2012

CROSSREFS

Sequence in context: A171595 A106483 A145673 * A155153 A014580 A197227

Adjacent sequences:  A040113 A040114 A040115 * A040117 A040118 A040119

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 28 22:18 EDT 2015. Contains 261164 sequences.