A201713 Primes of the form 2n^2 - 5.

3, 13, 67, 157, 283, 643, 877, 1453, 3037, 4603, 5197, 5827, 7933, 8707, 12163, 14107, 17293, 18427, 19597, 30253, 34843, 38083, 41467, 56443, 58477, 62653, 66973, 71437, 83227, 93307, 95917, 98563, 103963, 109507, 118093, 123997

Offset: 1

Author

Vincenzo Librandi, Dec 04 2011

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Programs

Magma

[a: n in [2..300] | IsPrime(a) where a is 2*n^2-5];

Mathematica

Select[Table[2n^2-5,{n,2,1000}],PrimeQ]