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A134629 Least natural number in English which require n letters to spell excluding spaces and hyphens. The inverse of A005589. 6
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,3

COMMENTS

Variant of A080777. [R. J. Mathar, Dec 13 2008]

LINKS

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.

EXAMPLE

a(3)=1 "one", a(4)=0 "zero", a(5)=3 "three", a(6)=11 "eleven", a(7)=15 "fifteen", etc.

MATHEMATICA

(* 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 *)

CROSSREFS

Cf. A005589.

Sequence in context: A273869 A235913 A132363 * A245522 A030715 A056247

Adjacent sequences:  A134626 A134627 A134628 * A134630 A134631 A134632

KEYWORD

nonn,word

AUTHOR

Robert G. Wilson v, Nov 04 2007

STATUS

approved

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Last modified March 29 13:11 EDT 2017. Contains 284270 sequences.