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

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Last modified December 12 12:30 EST 2019. Contains 329958 sequences. (Running on oeis4.)