A177139 - OEIS

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A177139

Numbers n such that (3*n-4, 3*n-2) is a twin prime pair.

3, 5, 7, 11, 15, 21, 25, 35, 37, 47, 51, 61, 65, 67, 77, 81, 91, 95, 105, 117, 141, 145, 155, 175, 191, 201, 207, 215, 221, 271, 275, 277, 287, 295, 341, 345, 351, 355, 365, 385, 411, 427, 431, 435, 441, 477, 485, 495, 497

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

OFFSET

1,1

LINKS

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

FORMULA

a(n) = (A001359(n+1)+4)/3 = 1+A014574(n+1)/3 = 1+A167379(n). [Eds., May 03 2010]

MATHEMATICA

Flatten[Table[If[PrimeQ[3*n - 2] && PrimeQ[3*n - 4], n, {}], {n, 1, 500}]]

Select[Range[500], And@@PrimeQ[3#-{4, 2}]&] (* Harvey P. Dale, Jun 21 2012 *)

CROSSREFS

Sequence in context: A337217 A333380 A361826 * A252793 A351924 A062488