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Primes p such that 74 is not a square mod p.
1

%I #9 Sep 08 2022 08:44:53

%S 3,11,17,23,31,53,67,79,83,89,97,101,103,107,113,139,149,157,167,173,

%T 181,191,193,197,199,211,229,239,241,257,269,281,293,307,311,313,317,

%U 349,353,373,379,383,397,401,409

%N Primes p such that 74 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038960/b038960.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime@Range[2120], JacobiSymbol[74, #] == - 1 &] (* _Vincenzo Librandi_, Sep 09 2012 *)

%o (Magma) [ p: p in PrimesUpTo(409) | not IsSquare(R! 74) 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 09 2012