A138620 Nonnegative integers n such that 12*n-1 is prime.

1, 2, 4, 5, 6, 7, 9, 11, 14, 15, 16, 19, 20, 21, 22, 26, 29, 30, 32, 35, 36, 37, 39, 40, 41, 42, 47, 49, 50, 54, 55, 57, 60, 62, 69, 70, 72, 74, 76, 79, 81, 82, 85, 86, 91, 92, 96, 97, 99, 102, 105, 107, 109, 110, 114, 119, 120, 121, 124, 125, 126, 127, 130

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, May 14 2008

Keywords

• nonn

Examples

			12*1-1=11, 12*2-1=23, 12*4-1=47, 12*5-1=59, ...
		

Links

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

Crossrefs

Cf. A068231 (resulting primes).

Programs

Mathematica

a={};Do[x=12*n-1;If[PrimeQ[x],AppendTo[a,n]],{n,10^2}];a
Select[Range[500],PrimeQ[12#-1]&] (* Harvey P. Dale, May 14 2011 *)

Extensions

More terms from Harvey P. Dale, May 14 2011