OFFSET
1,1
COMMENTS
Also, only entries p == 1 (mod 4) of the sequence are not squares mod 11 (from the quadratic reciprocity law). - Lekraj Beedassy, Jul 21 2004
Except for 2, inert primes in Z[sqrt(11)]. 2 splits as (-1)*(3 - sqrt(11))*(3 + sqrt(11)). Cf. A296936. - Alonso del Arte, Jan 02 2015
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime@Range[120], JacobiSymbol[11, #] == -1 &] (* Vincenzo Librandi, Sep 08 2012 *)
PROG
(PARI) isok(p) = isprime(p) && !((p%2) && issquare(Mod(11, p))); \\ Michel Marcus, Jul 04 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Offset changed from 0 to 1 by Vincenzo Librandi, Sep 08 2012
Definition edited by N. J. A. Sloane, Jul 04 2023
STATUS
approved