login
A216741
Primes p such that x^20 = -2 has no solution mod p.
2
5, 7, 11, 13, 17, 23, 29, 31, 37, 41, 47, 53, 61, 71, 79, 97, 101, 103, 109, 127, 131, 137, 149, 151, 157, 167, 173, 181, 191, 193, 197, 199, 211, 223, 229, 239, 241, 263, 269, 271, 277, 281, 293, 311, 313, 317, 331, 349, 359, 367, 373, 383, 389, 397, 401
OFFSET
1,1
COMMENTS
Complement of A051079 relative to A000040.
LINKS
MATHEMATICA
ok[p_]:= Reduce[Mod[x^20 + 2, p] == 0, x, Integers] == False; Select[Prime[Range[100]], ok]
CROSSREFS
Sequence in context: A054794 A104860 A216751 * A290507 A139812 A180951
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Sep 15 2012
STATUS
approved