%I #6 Nov 09 2018 14:23:43
%S 0,1,2,3,4,5,6,8,11,20,100,1000,1000000,1000000000,1000000000000000,
%T 1000000000000000000000000,1000000000000000000000000000
%N Numbers k with property that spelling k in American English requires a new letter of the alphabet.
%C The large numbers are (new letter in uppercase): "one Billion" (10^9), "one Quadrillon" (10^15), "one sePtillion" (10^24) and "one oCtillion" (10^27). Their names and definitions are based on the American system.
%H Landon Curt Noll, <a href="http://www.isthe.com/cgi-bin/number.cgi">The English name of a number</a>
%H R. Rowlett, <a href="http://www.unc.edu/~rowlett/units/large.html">Names for large numbers</a>
%e Spelling "zero" requires letters "z", "e", "r", "o". Spelling "one" requires a new letter, "n". Spelling "two" requires new letters, "t" and "w"; etc. Letters "j" and "k" are never used.
%e "1000" (one thousand) is the smallest number that requires an "a".
%K easy,fini,full,nonn,word
%O 0,3
%A Jean Fontaine (jfontain(AT)odyssee.net), Dec 30 1999
%E Corrected by _Andrew Weimholt_, Sep 27 2009