A038888 Primes p such that 15 is not a square mod p.

13, 19, 23, 29, 31, 37, 41, 47, 73, 79, 83, 89, 97, 101, 107, 139, 149, 151, 157, 167, 193, 199, 211, 227, 263, 269, 271, 277, 281, 313, 331, 337, 347, 373, 379, 383, 389, 397, 401, 433, 439, 443, 449, 457, 461

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Comments

Subset of A040136.

Also primes p such that p divides 5^(p-1)/2 + 3^(p-1)/2. - Cino Hilliard, Sep 06 2004

Links

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

Programs

Mathematica

Select[Prime@Range[120], JacobiSymbol[15, #] == -1 &] (* Vincenzo Librandi, Sep 08 2012 *)