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A049547 Primes p such that x^15 = 2 has a solution mod p. 2
2, 3, 5, 17, 23, 29, 43, 47, 53, 59, 83, 89, 107, 109, 113, 127, 137, 149, 157, 167, 173, 179, 197, 223, 227, 229, 233, 239, 251, 257, 263, 269, 277, 283, 293, 307, 317, 347, 353, 359, 383, 389, 397, 419, 431, 433, 439, 443, 449, 457, 467, 479, 499, 503, 509 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A059308 relative to A000040. - Vincenzo Librandi, Sep 13 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^15- 2, p] == 0, x, Integers]=!=False; Select[Prime[Range[200]], ok] (* Vincenzo Librandi, Sep 13 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(600) | exists(t){x : x in ResidueClassRing(p) | x^15 eq 2}]; // Vincenzo Librandi, Sep 13 2012

CROSSREFS

Cf. A000040, A059308.

Sequence in context: A119405 A032733 A111632 * A049577 A121558 A240679

Adjacent sequences:  A049544 A049545 A049546 * A049548 A049549 A049550

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified September 28 10:51 EDT 2020. Contains 337393 sequences. (Running on oeis4.)