This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A137628 #22 Jun 22 2018 10:37:54 %S A137628 6,35,185,737,1781,8367,8373,19277,175337,175353,33952823,4377722981, %T A137628 4377723017,1242030992721,1242030992727 %N A137628 Semiprimes (p+4) associated with last prime in A137626. %F A137628 For each p, the semiprime is p + 4. %F A137628 a(n) = A137626(n) + 4. - _Sean A. Irvine_, Feb 13 2012 %e A137628 a(2)=35 because when p=29 (resp. 31), p+4=33 (resp. 35) and are semiprime (3*3 resp. 5*7). %Y A137628 Cf. A001358, A137625, A137626, A137627. %K A137628 more,nonn %O A137628 1,1 %A A137628 _Enoch Haga_, Jan 30 2008 %E A137628 a(11) from _Sean A. Irvine_, Feb 12 2012 %E A137628 a(1) corrected for consistency with change in A137626 by _Sean A. Irvine_, Jun 21 2018 %E A137628 a(12)-a(15) from _Giovanni Resta_, Jun 22 2018