1,1

For each p, the semiprime is p+4.

a(2)=35 because when p=31, p+4=35 and is semiprime (5*7)

Cf. A001358 A137625 A137626, A137627.

Sequence in context: A034957 A002418 A118414 this_sequence A020297 A143224 A068810

Adjacent sequences: A137625 A137626 A137627 this_sequence A137629 A137630 A137631

easy,more,nonn

Enoch Haga (Enokh(AT)comcast.net), Jan 30 2008