A105139 Numbers k such that 512*k+257 is prime.

0, 1, 6, 15, 18, 27, 28, 43, 45, 52, 60, 61, 70, 73, 78, 81, 85, 90, 96, 97, 111, 112, 117, 138, 147, 151, 153, 165, 172, 178, 187, 192, 196, 202, 208, 210, 211, 213, 216, 222, 228, 231, 235, 243, 250, 252, 253, 255, 262, 265, 270, 280, 291, 298, 301, 312, 325, 328, 330, 337

Offset: 1

Author

N. J. A. Sloane, based on correspondence from Marco Matosic, Apr 11 2005

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A095278, A105133-A105140, A002145, A007521, A105126-A105132.

Programs

Magma

[n: n in [0..350] | IsPrime(512*n + 257)]; // Vincenzo Librandi, Jan 08 2013

Mathematica

Select[Range[0, 500], PrimeQ[512 # + 257]&] (* Vincenzo Librandi, Jan 08 2013 *)

PARI

is(n)=isprime(512*n+257) \\ Charles R Greathouse IV, Jun 06 2017