A161763 - OEIS

%I #6 Nov 21 2013 12:49:38

%S 55,187,1271,3953,13843,34189,78391,129551,307961,351613,616081,

%T 753343,1155481,1350163,1461617,2073551,2282977,2999743,3367081,

%U 4293103,5503691,8427373,9060019,10751441,14039813,17164349,19439137,20775283,22781333

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

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

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

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

%Y Cf. A000040, A001359, A006519.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Jun 18 2009

%E Corrected by _R. J. Mathar_, Oct 21 2009