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 A141818 #3 Aug 24 2012 10:50:01 %S A141818 23,31,41,43,53,61,67,71,73,83,89,97,101,131,151,181,191,211,223,241, %T A141818 251,263,271,281,311,313,317,331,353,401,419,421,431,433,461,463,491, %U A141818 503 %N A141818 "Early bird" prime numbers: write the natural numbers in a string 12345678910111213.... Sequence gives prime numbers which occur in the string ahead of their natural place. %C A141818 Subset of A116700 %e A141818 "23" appears in 1"23"4567..., ahead of its position after "22", so is a member. %Y A141818 Cf. A116700. %K A141818 easy,nonn,base %O A141818 1,1 %A A141818 _Paolo P. Lava_ and _Giorgio Balzarotti_, Jul 08 2008