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 A131593 #5 Mar 31 2012 10:26:06 %S A131593 4,12,34,118,520,1738,5310,13528,25332 %N A131593 Number of norep emirps less than 10^n. %C A131593 Partial sums of A003684. [From _Lekraj Beedassy_, Jun 07 2009] %e A131593 There are 12 norep emirps less than 100 %Y A131593 Cf. A046732, A031991, A030540. %K A131593 base,full,nonn,fini %O A131593 1,1 %A A131593 _Harvey P. Dale_, Aug 30 2007