1,1

Numbers of the form A007510(i)*A007510(j), i <> j.

Table of n, a(n) for n=1..52.

a(50) = 1081 because 23*37 = 1081, where 23 is the 2nd non-twin prime and 37 is the 3rd non-twin prime.

Cf. A007510, A037074, A085434.

Sequence in context: A103381 A101577 A051413 * A085434 A245372 A020351

Adjacent sequences: A167280 A167281 A167282 * A167284 A167285 A167286

nonn

Juri-Stepan Gerasimov, Nov 01 2009, Nov 02 2009

Definition clarified and 851 inserted by R. J. Mathar, May 21 2010

approved