A038897 - OEIS

A038897

23 is a square mod p.

2, 7, 11, 13, 19, 23, 29, 41, 43, 67, 73, 79, 83, 101, 103, 107, 173, 191, 193, 197, 199, 227, 233, 251, 257, 263, 269, 277, 283, 317, 349, 353, 359, 367, 379, 383, 397, 409, 419, 431, 449, 461, 467, 479, 503, 509

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Also, only entries p=1 (mod 4) of the sequence are squares mod 23 (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[100]], JacobiSymbol[23, #] != -1 &] (* Vincenzo Librandi, Sep 07 2012 *)

CROSSREFS

Sequence in context: A338173 A138889 A097143 * A161681 A020583 A140557

Adjacent sequences: A038894 A038895 A038896 * A038898 A038899 A038900

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved