A268577 Numbers m such that 3*m^2-5 is a prime.

2, 4, 6, 18, 22, 24, 28, 32, 34, 38, 46, 48, 56, 62, 66, 84, 88, 98, 104, 106, 122, 126, 132, 148, 154, 158, 164, 172, 174, 182, 192, 214, 218, 224, 242, 244, 252, 258, 274, 276, 284, 286, 288, 308, 312, 318, 326, 328, 336, 342, 346, 356, 358, 368, 372, 374

Offset: 1

Author

Vincenzo Librandi, Feb 16 2016

Keywords

• nonn

Crossrefs

Cf. A201717 (associated primes).

Programs

Magma

[n: n in [2..400] | IsPrime(3*n^2-5)];

Mathematica

Select[Range[2, 500], PrimeQ[3 #^2 - 5] &]