A264821 Centered 14-gonal (or tetradecagonal) primes.

43, 211, 631, 1093, 1471, 2143, 4201, 6091, 7393, 8821, 17851, 23143, 24781, 25621, 33811, 36793, 38851, 39901, 42043, 45361, 53593, 57331, 63841, 76441, 91771, 96643, 99961, 101641, 110251, 126631, 128521, 138181, 146161, 152293, 158551, 184843, 189421, 220543

Offset

1,1

Comments

Primes of the form 7*k^2 - 7*k + 1.

Links

Table of n, a(n) for n=1..38.

OEIS Wiki, Figurate numbers

Eric Weisstein's World of Mathematics, Centered Polygonal Number

Eric Weisstein's World of Mathematics, Prime Number

Mathematica

Select[Table[7n^2-7n+1, {n, 200}], PrimeQ] (* Harvey P. Dale, Jul 27 2021 *)

Prog

(PARI) for(n=1, 1e3, if(isprime(k=7*n^2-7*n+1), print1(k, ", "))) \\ Altug Alkan, Nov 26 2015

Crossrefs

Cf. A069127, A000040.

Sequence in context: A193144 A142659 A140041 * A013307 A043375 A038479

Adjacent sequences: A264818 A264819 A264820 * A264822 A264823 A264824

Keyword

nonn

Author

Ilya Gutkovskiy, Nov 26 2015

Status

approved