A120344 Numbers k such that 23*k + 1 is a prime.

2, 6, 12, 20, 26, 30, 36, 42, 44, 50, 56, 60, 62, 72, 84, 86, 102, 104, 110, 132, 134, 140, 144, 146, 162, 170, 174, 176, 194, 210, 212, 216, 222, 224, 240, 246, 254, 260, 264, 270, 272, 294, 302, 306, 312, 326, 330, 342, 366, 380, 390, 396, 404, 410, 420, 446

Offset: 1

Author

Parthasarathy Nambi, Jun 24 2006

Keywords

• nonn
• less

Examples

			If k=86 then 23*k + 1 = 1979 (prime).
		

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Programs

Magma

[ n: n in [0..1500] | IsPrime(23*n + 1) ] // Vincenzo Librandi, Jan 31 2011

Mathematica

Select[Range[1000], PrimeQ[23*# + 1] &] (* Stefan Steinerberger, Jul 22 2006 *)

Extensions

More terms from Stefan Steinerberger, Jul 22 2006