A155736 Numbers n such that 4*n^2+2*n-1 is a prime.

1, 2, 3, 4, 5, 8, 10, 12, 13, 14, 15, 19, 22, 23, 24, 25, 27, 28, 30, 32, 33, 34, 35, 38, 43, 47, 48, 50, 57, 60, 63, 65, 67, 69, 70, 72, 74, 77, 79, 80, 82, 87, 88, 90, 92, 93, 94, 98, 103, 109, 110, 115, 118, 120, 122, 123, 124, 129, 132, 134, 144, 145, 147, 148, 149

Offset: 1

Author

Vincenzo Librandi, Jan 26 2009

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A155737, A155738.

Programs

Magma

[n: n in [0..150] | IsPrime(4*n^2+2*n-1)]; // Vincenzo Librandi, Sep 24 2012

Mathematica

Select[Range[0, 200], PrimeQ[4#^2+2#-1]&] (* Vincenzo Librandi, Sep 24 2012 *)

Extensions

Edited by N. J. A. Sloane, Jun 25 2010