A138639 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

(list; graph; refs; listen; history; text; internal format)

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