A144834 - OEIS

A144834

Numbers n such that the two numbers n+1 and n+3 are both prime.

2, 4, 10, 16, 28, 40, 58, 70, 100, 106, 136, 148, 178, 190, 196, 226, 238, 268, 280, 310, 346, 418, 430, 460, 520, 568, 598, 616, 640, 658, 808, 820, 826, 856, 880, 1018, 1030, 1048, 1060, 1090, 1150, 1228, 1276, 1288, 1300, 1318, 1426, 1450, 1480, 1486, 1606

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OFFSET

1,1

COMMENTS

1 less than the lesser of each twin prime pair. [Harvey P. Dale, Nov 08 2011]

LINKS

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

FORMULA

a(n) = A014574(n)-2 = A001359(n)-1. - R. J. Mathar, Sep 24 2008

MATHEMATICA

Transpose[Select[Partition[Prime[Range[300]], 2, 1], Last[#]-First[#] == 2&]][[1]]-1 (* Harvey P. Dale, Nov 08 2011 *)

CROSSREFS