1,1

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

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

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

Cf. A297176

Sequence in context: A027697 A235475 A146315 * A019346 A045369 A157975

Adjacent sequences: A038889 A038890 A038891 * A038893 A038894 A038895

nonn

N. J. A. Sloane.

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

approved