A161763 Product of the two primes with indices equal to the members of the n-th twin prime pair.

55, 187, 1271, 3953, 13843, 34189, 78391, 129551, 307961, 351613, 616081, 753343, 1155481, 1350163, 1461617, 2073551, 2282977, 2999743, 3367081, 4293103, 5503691, 8427373, 9060019, 10751441, 14039813, 17164349, 19439137, 20775283, 22781333

Offset

1,1

Links

Table of n, a(n) for n=1..29.

Formula

a(n)=A000040(A001359(n))*A000040(A006519(n)).

Example

prime(3)*prime(5)=55. prime(5)*prime(7) = 187. prime(11)*prime(13)=1271. prime(17)*prime(19)=3953.

Mathematica

Prime[First[#]] Prime[Last[#]]&/@Select[Partition[Prime[Range[200]], 2, 1], Last[#]-First[#]==2&]  (* Harvey P. Dale, Feb 22 2011 *)

Crossrefs

Cf. A000040, A001359, A006519.

Sequence in context: A135657 A178793 A334531 * A189005 A105442 A158646

Adjacent sequences: A161760 A161761 A161762 * A161764 A161765 A161766

Keyword

nonn

Author

Juri-Stepan Gerasimov, Jun 18 2009

Extensions

Corrected by R. J. Mathar, Oct 21 2009

Status

approved