A038956 - OEIS

A038956

Primes p such that 71 is not a square mod p.

3, 13, 17, 19, 41, 43, 53, 61, 79, 83, 97, 103, 107, 113, 131, 137, 149, 151, 167, 173, 179, 181, 191, 193, 197, 199, 223, 241, 251, 257, 263, 269, 271, 281, 311, 317, 337, 349, 353, 359, 367, 379, 389, 397, 401

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OFFSET

1,1

COMMENTS

Also, only entries p=1 (mod 4) of the sequence are not squares mod 71 (from the quadratic reciprocity law). - Lekraj Beedassy, Jul 21 2004

LINKS

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

MATHEMATICA

Select[Prime@Range[120], JacobiSymbol[71, #] == - 1 &] (* Vincenzo Librandi, Sep 09 2012 *)

PROG

(Magma) [ p: p in PrimesUpTo(401) | not IsSquare(R! 71) where R:= ResidueClassRing(p) ]; // Vincenzo Librandi, Sep 10 2012

CROSSREFS

Sequence in context: A370726 A107922 A119889 * A309291 A343123 A040123

Adjacent sequences: A038953 A038954 A038955 * A038957 A038958 A038959

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Offset changed from 0 to 1 by Vincenzo Librandi, Sep 09 2012

STATUS

approved