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 A242716 #16 Sep 22 2014 07:46:08 %S A242716 12317,50637287,147111617,5174048597 %N A242716 Composite numbers of the form A242489(n) - 3. %C A242716 a(5) (if it exists) = A242489(k) - 3, k >= 5 * 10^7. - _Hiroaki Yamanouchi_, Sep 22 2014 %e A242716 a(1) = A242489(25) - 3 = 12317 = 109 * 113; %e A242716 a(2) = A242489(900) - 3 = 50637287 = 7103 * 7129; %e A242716 a(3) = A242489(1436) - 3 = 147111617 = 12097 * 12161; %e A242716 a(4) = A242489(7084) - 3 = 5174048597 = 71789 * 72073. %Y A242716 Cf. A242489, A242490, A242770. %K A242716 nonn,more %O A242716 1,1 %A A242716 _Vladimir Shevelev_ and _Peter J. C. Moses_, May 21 2014 %E A242716 a(4) from _Hiroaki Yamanouchi_, Sep 22 2014