A264821 - OEIS

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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

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

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 *)