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 A137627 #8 Jun 22 2018 10:41:09 %S A137627 6,33,177,713,1745,8301,8301,19217,175233,175233,33952613,4377722627, %T A137627 4377722627,1242030992177,1242030992177 %N A137627 Semiprimes (p+4) associated with first prime in A137625. %C A137627 Some terms may overlap: e.g., k=9 and k=10 both begin with p=175229 where p+4 = 175233. %F A137627 For each p, the semiprime is p+4. %e A137627 a(2)=33 because if p=29, then p+4 is 33 and semiprime (3*11). %Y A137627 Cf. A001358, A137625, A137626, A137628. %K A137627 more,nonn %O A137627 1,1 %A A137627 _Enoch Haga_, Jan 30 2008 %E A137627 a(1) corrected by and a(11)-a(15) from _Giovanni Resta_, Jun 22 2018