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A144834 Numbers n such that the two numbers n+1 and n+3 are both prime. 3
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 (list; graph; refs; listen; history; text; internal format)
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

Cf. A053319 (first differences).

Sequence in context: A123689 A137928 A293154 * A006584 A280186 A032246

Adjacent sequences:  A144831 A144832 A144833 * A144835 A144836 A144837

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Sep 22 2008

EXTENSIONS

Definition edited and extended by R. J. Mathar, Sep 24 2008

STATUS

approved

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Last modified November 21 00:36 EST 2018. Contains 317427 sequences. (Running on oeis4.)