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%I #9 Dec 11 2021 04:33:54
%S 1,0,3,11,15,13,17,21,24,23,73,3000,101,104,103,111,115,113,117,121,
%T 124,123,173,323,373,1101,1104,1103,1111,1115,1113,1117,1121,1124,
%U 1123,1173,1323,1373,3323,3373,11373,13323,13373,17373,21373,23323,23373,73373
%N Least natural number in English which requires exactly n characters to spell including spaces and hyphens, or 0 if no such number exists. The inverse of A052360.
%C This is to A052360 as A134629 is to A005589. Also assumes no 'and' is used to spell integers. This deviates from A134629 at a(10). "twenty-one" is the smallest integer whose standard English name has a hyphen. "one hundred" is the smallest integer whose standard English name has a space. "one hundred twenty-one" is the smallest integer whose standard English name has a space and a hyphen.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Number.html">Number</a>
%e a(3) = 1 because "one" has 3 characters.
%e a(4) = 0 because "zero" has 4 characters.
%e a(5) = 3 because "three" has 5 characters.
%e a(6) = 11 because "eleven" has 6 characters.
%e a(7) = 15 because "fifteen" has 7 characters.
%e a(8) = 13 because "thirteen" has 8 characters.
%e a(9) = 17 because "seventeen" has 9 characters.
%e a(10) = 21 because "twenty-one" has 10 characters.
%e a(11) = 24 because "twenty-four" has 11 characters.
%e a(12) = 23 because "twenty-three" has 12 characters.
%e a(13) = 73 because "seventy-three" has 13 characters.
%e a(14) = 3000 because "three thousand" has 14 characters.
%Y Cf. A005589, A052360, A119960, A129774, A134629.
%K easy,nonn,word
%O 3,3
%A _Jonathan Vos Post_, Nov 08 2007
%E Corrected and extended by _Martin Fuller_, Nov 24 2007
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