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A264823
Centered 16-gonal (or hexadecagonal) primes.
1
17, 97, 241, 337, 449, 577, 881, 1249, 3041, 3361, 3697, 4049, 4801, 6961, 7937, 9521, 10657, 13121, 14449, 15137, 16561, 18049, 23761, 25537, 26449, 31249, 32257, 37537, 39761, 40897, 46817, 48049, 49297, 54449, 58481, 64081, 65521, 66977, 68449, 77617, 79201
OFFSET
1,1
COMMENTS
Primes of the form 8*k^2 - 8*k + 1.
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[8k^2-8k+1, {k, 0, 100}], PrimeQ] (* Harvey P. Dale, Mar 08 2023 *)
PROG
(PARI) for(n=1, 1e3, if(isprime(k=8*n^2-8*n+1), print1(k, ", "))) \\ Altug Alkan, Nov 26 2015
CROSSREFS
Sequence in context: A070186 A142189 A325068 * A081593 A078901 A078902
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Nov 26 2015
STATUS
approved