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A038956 Primes p such that 71 is not a square mod p. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A218364 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

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Last modified September 18 11:19 EDT 2021. Contains 347518 sequences. (Running on oeis4.)