This site is supported by donations to The OEIS Foundation.

The October issue of the Notices of the Amer. Math. Soc. has an article about the OEIS.

 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. 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

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

Last modified September 25 22:57 EDT 2018. Contains 315425 sequences. (Running on oeis4.)