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Primes p such that 87 is not a square mod p.
1

%I #7 Sep 08 2022 08:44:53

%S 5,7,11,37,47,53,61,67,73,97,103,131,139,149,151,157,173,191,193,197,

%T 199,223,229,233,251,257,263,281,283,311,337,353,359,401,409,421,433,

%U 439,443,463,467,479,487,491,499

%N Primes p such that 87 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038976/b038976.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[120]], JacobiSymbol[87, #]==-1 &] (* _Vincenzo Librandi_, Sep 10 2012 *)

%o (Magma) [ p: p in PrimesUpTo(499) | not IsSquare(R! 87) where R:= ResidueClassRing(p) ]; // _Vincenzo Librandi_, Sep 10 2012

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_.

%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 10 2012