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 A123248 #12 Mar 23 2020 04:03:33 %S A123248 11,19,11,37,37,13109,1607621,70381,1801273,1483,52489012879 %N A123248 Largest prime factor in A071576 starting from 4th position. %F A123248 a(n) = A006530(A071576(n+3)). - _Amiram Eldar_, Mar 23 2020 %Y A123248 Cf. A071576. %K A123248 nonn,more %O A123248 1,1 %A A123248 _Artur Jasinski_, Nov 06 2006 %E A123248 a(11) calculated from the data at A071576 by _Amiram Eldar_, Mar 23 2020