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A137877 Numbers n such that 18n-1 and 18n+1 are twin primes. 3
1, 4, 6, 10, 11, 15, 24, 29, 45, 46, 49, 59, 64, 71, 90, 104, 111, 116, 119, 126, 130, 144, 155, 165, 176, 181, 185, 196, 199, 204, 214, 225, 231, 235, 241, 249, 251, 266, 274, 276, 279, 301, 314, 319, 325, 326, 350, 364, 365, 370, 386, 396, 406, 416, 420, 431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

MATHEMATICA

q=18; lst={}; Do[r=n*q; If[PrimeQ[r-1]&&PrimeQ[r+1], AppendTo[lst, n]], {n, 1, 10^3}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 07 2008 *)

CROSSREFS

Cf. A124519, A135023, A135368, A137876.

Sequence in context: A109270 A187331 A184923 * A246022 A174240 A287342

Adjacent sequences:  A137874 A137875 A137876 * A137878 A137879 A137880

KEYWORD

nonn

AUTHOR

Zak Seidov, Feb 19 2008

STATUS

approved

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Last modified July 24 03:01 EDT 2019. Contains 325290 sequences. (Running on oeis4.)