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 A156673 #4 Mar 30 2012 18:52:32 %S A156673 0,1,4,6,8,9,28,38,39,49,68,69,88,98,99,289,299,399,589,689,699,799, %T A156673 899,999,2899,3899,3999,5899,5999,6999,7999,9899,9999,19999,29999, %U A156673 39999,58999,68999,69999,88999,89999,99999,299899,299999,399999,499999,689999 %N A156673 a(1)=0, a(n+1) is the smallest nonprime with sum of digits > sum of digits of a(n). %e A156673 0, 1(1>0), 4(4>1), 6(6>4), 8(8>6), 9(9>8), 28(2+8>9), 38(3+8>2+8), 39(3+9>3+8), etc. %Y A156673 Cf. A067954. %K A156673 nonn,base %O A156673 1,3 %A A156673 _Juri-Stepan Gerasimov_, Feb 13 2009 %E A156673 Extended by _Charles R Greathouse IV_, Mar 25 2010