1,2

First column of A087307; main diagonal of A114656.

a(7) > 29*10^9; a(8) = 11978.

a(4) = 111 as 111, 115, 119, and 123 all are of the prime signature p*q.

Cf. A087307, A114656.

Adjacent sequences: A087303 A087304 A087305 this_sequence A087307 A087308 A087309

Sequence in context: A095225 A039934 A075514 this_sequence A139964 A048797 A108159

nonn,hard

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 02 2003

Edited and extended by David Wasserman (dwasserm(AT) earthlink.net), Jan 08 2006