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 A161389 #3 Mar 31 2012 14:00:42 %S A161389 0,1,2,3,4,5,8,9,10,15,31,1000,1000000000000, %T A161389 1000000000000000000000000000000000000, %U A161389 1000000000000000000000000000000000000000000 %N A161389 Spelling n in Spanish requires a new letter of the alphabet. %C A161389 CERO, UNo, DoS, Tres, cuAtro, cINco, ocHo, nueVe, dieZ, Quince, treinta Y uno, MiL, un Billon (10^12 in Spanish), un seXtillon (10^36), un sePtillon (10^42),... %C A161389 (New letter in uppercase).Letters "f","g","j","k","ss +-" and "w" are never used. %D A161389 http://mathforum.org/kb/thread.jspa?forumID=265&threadID=606989&messageID=1773344#1773344 [From _Claudio Meller_, Oct 30 2009] %Y A161389 A050933 %K A161389 fini,nonn,word %O A161389 1,3 %A A161389 _Claudio Meller_, Jun 08 2009 %E A161389 Corrected and edited by _Omar E. Pol_, Jul 06 2009