A138220 Numbers k such that 900*k^2 + 1 is prime.
3, 4, 5, 6, 7, 8, 9, 10, 14, 19, 23, 25, 26, 31, 32, 36, 38, 43, 44, 45, 47, 48, 62, 64, 66, 77, 81, 82, 85, 90, 91, 92, 95, 108, 112, 113, 116, 122, 129, 130, 136, 138, 139, 142, 147, 151, 153, 155, 164, 178, 179, 181, 183, 185, 190, 192, 195, 196, 199, 201, 202, 204
Offset: 1
Programs
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Magma
[n: n in [0..10000]| IsPrime(1+900*n^2)] // Vincenzo Librandi, Dec 13 2010
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Mathematica
Select[Range[250],PrimeQ[900#^2+1]&] (* Harvey P. Dale, May 20 2012 *)
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PARI
is(n)=isprime(1+900*n^2) \\ Charles R Greathouse IV, Jun 13 2017
Comments