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A040141 Primes p such that x^4 = 18 has a solution mod p. 2
2, 3, 7, 17, 23, 31, 41, 47, 71, 73, 79, 103, 127, 137, 151, 167, 191, 199, 223, 239, 263, 271, 311, 337, 359, 367, 383, 401, 431, 439, 449, 463, 479, 487, 503, 521, 569, 577, 599, 601, 607, 631, 641, 647, 719 (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 - 18, p]== 0, x, Integers]=!= False; Select[Prime[Range[180]], ok] (* Vincenzo Librandi, Sep 12 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(800) | exists(t){x : x in ResidueClassRing(p) | x^4 eq 18}]; // Vincenzo Librandi, Sep 12 2012

CROSSREFS

Cf. A040154.

Sequence in context: A089144 A045332 A045333 * A235627 A019335 A113425

Adjacent sequences:  A040138 A040139 A040140 * A040142 A040143 A040144

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 17 17:08 EDT 2019. Contains 326059 sequences. (Running on oeis4.)