The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A144834 Numbers n such that the two numbers n+1 and n+3 are both prime. 4
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 28 10:23 EDT 2020. Contains 333082 sequences. (Running on oeis4.)