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 A111380 #12 Mar 18 2016 04:41:14 %S A111380 13,17,19,59,79,389,499,997,1889,1999,6899,17989,8999,39989,49999, %T A111380 98999,199999,598999,599999,799999,2998999,2999999,4999999,9899999, %U A111380 19999999,29999999,59999999,189997999,389999999,689899999,699899999,998999999 %N A111380 Smallest prime whose digital sum is equal to the n-th composite number not congruent to 0 (modulo 3). %H A111380 Chai Wah Wu, <a href="/A111380/b111380.txt">Table of n, a(n) for n = 1..100</a> %Y A111380 Cf. A073867, A157695. %K A111380 nonn,base %O A111380 1,1 %A A111380 _Stefan Steinerberger_, Nov 09 2005 %E A111380 Edited and extended by _Robert G. Wilson v_, Nov 10 2005