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Numbers k such that 4*k^2 + 3 is prime.
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%I #15 Jan 14 2025 23:27:55

%S 1,2,4,5,7,11,14,19,25,26,31,32,35,37,38,46,47,53,56,61,65,67,70,73,

%T 77,79,80,86,89,109,115,121,122,124,128,137,143,149,152,158,161,163,

%U 170,175,178,182,184,199,203,208,212,215,217,220,229,235,236,242,254,256

%N Numbers k such that 4*k^2 + 3 is prime.

%o (Magma) [n: n in [1..1000] |IsPrime(4*n^2+3)]; // _Vincenzo Librandi_, Nov 16 2010

%o (PARI) is(n)=isprime(4*n^2+3) \\ _Charles R Greathouse IV_, Jun 05 2017

%Y Cf. A083022, A097698.

%K easy,nonn

%O 1,2

%A _Carl R. White_, Aug 20 2004