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 A073868 #5 Dec 05 2013 19:55:32 %S A073868 20,12,14,16,38,49,98,289,689,3899,5899,19999,68999,88999,299999, %T A073868 899999,5999999,7999999,49999999,98999999,199999999,889999999, %U A073868 2999999999,8999999999,88999999999,299999999999,499999999999,899999999999 %N A073868 a(n) is the smallest composite number with the sum of digits = the n-th prime number. %Y A073868 Cf. A073867. %K A073868 nonn,base %O A073868 1,1 %A A073868 _Amarnath Murthy_, Aug 15 2002 %E A073868 More terms from _Sascha Kurz_, Feb 03 2003