A262493 Centered 13-gonal (or tridecagonal) primes.

79, 131, 859, 2731, 5279, 6449, 8191, 10141, 15289, 17239, 20021, 20749, 23011, 26209, 38039, 41081, 45319, 46411, 50909, 54419, 59281, 65651, 70981, 76519, 80809, 86711, 92821, 99139, 126491, 128311, 135721, 159199, 167441, 175891, 200201, 209431, 221261, 230959

Offset

1,1

Comments

Primes of the form (13*k^2 - 13*k + 2)/2.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

OEIS Wiki, Figurate numbers

Eric Weisstein's World of Mathematics, Centered Polygonal Number

Eric Weisstein's World of Mathematics, Prime Number

Mathematica

Select[Table[(13k^2-13k+2)/2, {k, 200}], PrimeQ] (* Harvey P. Dale, Jun 16 2023 *)

Prog

(PARI) for(n=1, 1e3, if(isprime(k=(13*n^2-13*n+2)/2), print1(k, ", "))) \\ Altug Alkan, Nov 26 2015

Crossrefs

Cf. A069126, A000040.

Sequence in context: A135985 A142520 A140743 * A349234 A141997 A107184

Adjacent sequences: A262490 A262491 A262492 * A262494 A262495 A262496

Keyword

nonn

Author

Ilya Gutkovskiy, Nov 26 2015

Status

approved