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A264844
Centered 19-gonal (or nonadecagonal) primes.
2
191, 1483, 2281, 5701, 11971, 14821, 15581, 21433, 26183, 39521, 43283, 54151, 60041, 61561, 72733, 81283, 120233, 135661, 137941, 166783, 187531, 220933, 229711, 244721, 282683, 292601, 306091, 323381, 378101, 409033, 457711, 461891, 478801, 513533, 526871
OFFSET
1,1
COMMENTS
Primes of the form (19*k^2 - 19*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
MAPLE
select(isprime, [seq((19*k^2-19*k+2)/2, k=0..10^4)]); # Robert Israel, Jul 02 2024
MATHEMATICA
Select[(19 #^2 - 19 # + 2)/2 &@ Range@ 250, PrimeQ] (* Michael De Vlieger, Nov 27 2015 *)
PROG
(PARI) for(n=1, 1e3, if(isprime(k=(19*n^2-19*n+2)/2), print1(k, ", "))) \\ Altug Alkan, Nov 26 2015
CROSSREFS
Sequence in context: A083980 A144327 A107955 * A061331 A177683 A209549
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Nov 26 2015
STATUS
approved