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 A103313 #5 Aug 15 2015 10:31:12 %S A103313 0,1,4,5,6,20,31,54,306,356,762,3174,20240,22693,35793,58491,81251, %T A103313 206410,228533,3987683,5635890 %N A103313 Positions of records in the continued fraction expansion of the prime constant. %Y A103313 Cf. A051006, A051007, A102878. %K A103313 nonn,more %O A103313 0,3 %A A103313 _Eric W. Weisstein_, Jan 30 2005