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A113536
Numbers k such that k^2 + 13 is prime.
13
0, 2, 4, 10, 12, 16, 18, 28, 40, 42, 44, 46, 60, 68, 72, 82, 84, 88, 94, 108, 110, 114, 116, 122, 126, 142, 144, 152, 158, 180, 192, 194, 198, 200, 220, 222, 264, 266, 268, 282, 284, 296, 298, 332, 336, 340, 354, 378, 380, 418, 420, 430, 434, 446, 464, 466, 486
OFFSET
1,2
LINKS
EXAMPLE
If n=40 then n^2 + 13 = 1613 (prime), so 40 is in the sequence.
MATHEMATICA
With[{k=13}, Select[Range[1000], PrimeQ[ #^2+k]&]]
PROG
(PARI) is(n)=isprime(n^2+13) \\ Charles R Greathouse IV, Feb 17 2017
CROSSREFS
Other cases: A005574 k=1, A067201 k=2, A049422 k=3, A007591 k=4, A078402 k=5, A114269-A114275 k=6-12.
Sequence in context: A278465 A129412 A266115 * A081887 A085344 A288225
KEYWORD
nonn
AUTHOR
Zak Seidov, Jan 13 2006
EXTENSIONS
Edited by R. J. Mathar, Aug 07 2008
STATUS
approved