A038972 Primes p such that 85 is not a square mod p.

2, 11, 13, 29, 31, 41, 43, 47, 53, 61, 67, 71, 79, 83, 103, 109, 127, 131, 137, 139, 157, 181, 199, 211, 223, 241, 257, 263, 269, 293, 307, 311, 353, 373, 379, 383, 401, 419, 431, 433, 439, 443, 449, 457, 463, 467

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

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

Programs

Magma

[2] cat [ p: p in PrimesUpTo(467) | not IsSquare(R! 85) where R:= ResidueClassRing(p) ]; // Vincenzo Librandi, Sep 10 2012

Mathematica

Select[Prime[Range[120]], JacobiSymbol[#, 85] == -1 &] (* Vincenzo Librandi Sep 10 2012 *)

Extensions

Offset changed from 0 to 1 by Vincenzo Librandi, Sep 10 2012