A114270 Numbers k such that k^2 + 7 is prime.

0, 2, 4, 6, 8, 10, 12, 16, 18, 22, 26, 30, 32, 34, 36, 38, 40, 48, 52, 58, 60, 62, 66, 74, 76, 78, 100, 106, 110, 114, 116, 118, 120, 122, 124, 132, 136, 138, 144, 146, 148, 158, 162, 164, 176, 184, 186, 190, 192, 194, 206, 208, 216, 220, 228, 232, 248, 250, 256, 258

Offset: 1

Author

Zak Seidov, Nov 19 2005

Keywords

• nonn

Links

• G. C. Greubel, Table of n, a(n) for n = 1..2500

Crossrefs

Other sequences of the type "Numbers k such that k^2 + i is prime": A005574 (i=1), A067201 (i=2), A049422 (i=3), A007591 (i=4), A078402 (i=5), A114269 (i=6), this sequence (i=7), A114271 (i=8), A114272 (i=9), A114273 (i=10), A114274 (i=11), A114275 (i=12).

Programs

Mathematica

Select[Range[0,1000],PrimeQ[#^2+7]&] (* Vladimir Joseph Stephan Orlovsky, Feb 27 2011 *)

PARI

is(n)=isprime(n^2+7) \\ Charles R Greathouse IV, Jan 21 2015