A038892 Primes p such that 19 is not a square mod p.

2, 7, 11, 13, 23, 29, 37, 41, 43, 47, 53, 83, 89, 97, 109, 113, 131, 139, 163, 173, 181, 191, 193, 199, 239, 241, 251, 257, 263, 269, 271, 281, 283, 293, 311, 317, 337, 347, 359, 367, 373, 401, 409, 419, 421, 433

Offset

1,1

Comments

Also, only entries p=1 (mod 4) of the sequence are not squares mod 19 (from the quadratic reciprocity law). - Lekraj Beedassy, Jul 21 2004

Links

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

Mathematica

Select[Prime@Range[120], JacobiSymbol[19, #] == -1 &] (* Vincenzo Librandi, Sep 08 2012 *)

Crossrefs

Cf. A297176

Sequence in context: A364470 A235475 A146315 * A019346 A045369 A157975

Adjacent sequences: A038889 A038890 A038891 * A038893 A038894 A038895

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Offset changed from 0 to 1 by Vincenzo Librandi, Sep 08 2012

Status

approved