A138639 Nonnegative integers n such that 19*n-1 is prime.

2, 6, 8, 12, 20, 30, 32, 36, 42, 48, 56, 68, 72, 78, 90, 92, 96, 98, 110, 116, 126, 138, 140, 152, 156, 158, 168, 170, 176, 182, 186, 188, 198, 210, 212, 222, 236, 242, 246, 252, 272, 278, 288, 296, 302, 306, 308, 312, 320, 330, 338, 356, 368, 380, 386, 396

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

19*2-1=37, 19*6-1=113, 19*8-1=151, ...

Mathematica

a={}; Do[x=19*n-1; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; a
Select[Range[500], PrimeQ[19*#-1]&] (* Harvey P. Dale, Sep 05 2012 *)

Crossrefs

Sequence in context: A093006 A280236 A177869 * A082473 A325177 A263312

Adjacent sequences: A138636 A138637 A138638 * A138640 A138641 A138642

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 15 2008

Extensions

More terms from Harvey P. Dale, Sep 05 2012

Status

approved