A267455 - OEIS

A267455

Primes which are a square (mod 39).

3, 13, 43, 61, 79, 103, 127, 139, 157, 181, 199, 211, 277, 283, 313, 337, 367, 373, 433, 439, 523, 547, 571, 601, 607, 673, 727, 751, 757, 823, 829, 859, 883, 907, 919, 937, 991, 997, 1039, 1063, 1069, 1093, 1117, 1153, 1171, 1213, 1231, 1249, 1291, 1297, 1303, 1327, 1381, 1429, 1447, 1453, 1459, 1483

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OFFSET

1,1

COMMENTS

Motivated by the former (incorrect) definition of A191029.

Also, primes p which have Legendre symbols (p|3) = (p|13) = 1, together with 3 and 13.

Apparently this contains the 3 plus the elements of A139494. - R. J. Mathar, May 28 2025

LINKS

Paolo Xausa, Table of n, a(n) for n = 1..10000

MATHEMATICA

Join[{3, 13}, Select[Prime[Range[500]], JacobiSymbol[#, {3, 13}] == {1, 1} &]] (* Paolo Xausa, May 29 2025 *)

PROG