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 A199190 #8 Mar 31 2012 13:48:49 %S A199190 1,3,7,9,37,49,99,379,399,787,799,1989,1999,3999,6997,17899,18999, %T A199190 38989,67999,79899,79999,389899,499989,798979,897999,989899,2999997, %U A199190 2899999,4998999 %N A199190 Least integer having a larger digital sum than the previous term and such that 10^(n-1) + a(n) is a prime. %C A199190 Equivalent to A199124, but contains the same information in more condensed form. %o A199190 (PARI) a(n)=A199124(n)-10^(n-1) %Y A199190 Cf. A051885. %K A199190 nonn,base %O A199190 1,2 %A A199190 _M. F. Hasler_, Nov 03 2011