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A049560 Primes p such that x^28 = 2 has a solution mod p. 3
2, 7, 23, 31, 47, 73, 79, 89, 103, 151, 167, 191, 199, 223, 233, 257, 263, 271, 311, 353, 359, 367, 383, 431, 439, 479, 487, 503, 577, 593, 599, 601, 607, 631, 647, 719, 727, 751, 823, 839, 863, 881, 887, 919, 937, 983, 991, 1031, 1033, 1039, 1049, 1063, 1087 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A059315 relative to A000040. - Vincenzo Librandi, Sep 14 2012

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..1000

Index entries for related sequences

MATHEMATICA

ok[p_]:= Reduce[Mod[x^28 - 2, p] == 0, x, Integers] =!= False; Select[Prime[Range[200]], ok] (* Vincenzo Librandi, Sep 14 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1100) | exists(t){x : x in ResidueClassRing(p) | x^28 eq 2}]; // Vincenzo Librandi, Sep 14 2012

CROSSREFS

Cf. A000040, A059315.

Sequence in context: A072936 A049584 A045382 * A049588 A336786 A106020

Adjacent sequences:  A049557 A049558 A049559 * A049561 A049562 A049563

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified March 5 11:57 EST 2021. Contains 341823 sequences. (Running on oeis4.)