A097697 Numbers k such that 4*k^2 + 3 is prime.
1, 2, 4, 5, 7, 11, 14, 19, 25, 26, 31, 32, 35, 37, 38, 46, 47, 53, 56, 61, 65, 67, 70, 73, 77, 79, 80, 86, 89, 109, 115, 121, 122, 124, 128, 137, 143, 149, 152, 158, 161, 163, 170, 175, 178, 182, 184, 199, 203, 208, 212, 215, 217, 220, 229, 235, 236, 242, 254, 256
Offset: 1
Programs
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Magma
[n: n in [1..1000] |IsPrime(4*n^2+3)]; // Vincenzo Librandi, Nov 16 2010
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PARI
is(n)=isprime(4*n^2+3) \\ Charles R Greathouse IV, Jun 05 2017