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A134629
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Least natural number in English which require n letters to spell excluding spaces and hyphens. The inverse of A005589.
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6
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1, 0, 3, 11, 15, 13, 17, 24, 23, 73, 101, 104, 103, 111, 115, 113, 117, 124, 123, 173, 323, 373, 1104, 1103, 1111, 1115, 1113, 1117, 1124, 1123, 1173, 1323, 1373, 3323, 3373, 11373, 13323, 13373, 17373, 23323, 23373
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listen;
history;
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OFFSET
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3,3
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COMMENTS
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Variant of A080777. [R. J. Mathar, Dec 13 2008]
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LINKS
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Table of n, a(n) for n=3..43.
Landon Curt Noll, The English Name of a Number.
Eric Weisstein's World of Mathematics, Number.
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EXAMPLE
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a(3)=1 "one", a(4)=0 "zero", a(5)=3 "three", a(6)=11 "eleven", a(7)=15 "fifteen", etc.
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MATHEMATICA
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(* first load the a001477 a text file and then *)
f[n_] := Length@ Characters@ ToString@ lst[[n]]; g[n_] := Block[{k = 1}, While[ f[k] != n, k++]; k]; Array[g, 41, 3] - 1 (* Robert G. Wilson v, May 26 2013 *)
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CROSSREFS
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Cf. A005589.
Sequence in context: A186701 A022123 A132363 * A030715 A056247 A039275
Adjacent sequences: A134626 A134627 A134628 * A134630 A134631 A134632
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KEYWORD
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nonn,word
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AUTHOR
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Robert G. Wilson v, Nov 04 2007
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STATUS
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approved
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