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A262493
Centered 13-gonal (or tridecagonal) primes.
2
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
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
Sequence in context: A135985 A142520 A140743 * A349234 A141997 A107184
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Nov 26 2015
STATUS
approved