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A038964 Primes p such that 78 is not a square mod p. 1
5, 17, 19, 47, 61, 67, 71, 73, 79, 97, 103, 107, 113, 127, 131, 149, 157, 163, 167, 179, 181, 193, 197, 199, 233, 239, 241, 251, 257, 277, 293, 307, 317, 331, 347, 359, 367, 373, 379, 383, 409, 419, 431, 439, 443 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Prime@Range[120], JacobiSymbol[78, #] == - 1 &] (* Vincenzo Librandi, Sep 09 2012 *)

PROG

(MAGMA) [ p: p in PrimesUpTo(443) | not IsSquare(R! 78) where R:= ResidueClassRing(p) ]; // Vincenzo Librandi, Sep 10 2012

CROSSREFS

Sequence in context: A124873 A129745 A304129 * A019401 A217079 A153320

Adjacent sequences:  A038961 A038962 A038963 * A038965 A038966 A038967

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 February 28 11:31 EST 2020. Contains 332323 sequences. (Running on oeis4.)