A001167 Smallest natural number requiring n words in English (as spoken in England). (Formerly M5122 N2218)

1, 21, 21000, 101, 121, 1101, 1121, 21121, 101101, 101121, 121121, 1101121, 1121121, 21121121, 101101121, 101121121, 121121121, 1101121121, 1121121121, 21121121121, 101101121121, 101121121121, 121121121121, 1101121121121, 1121121121121, 21121121121121

Offset

1,2

References

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..26.

Robert G. Wilson v, American English names for the numbers from 0 to 11159 without spaces or hyphens.

Example

One, twenty-one, twenty-one thousand, one hundred and one, one hundred and twenty-one, ...

Crossrefs

Sequence in context: A167063 A115485 A172724 * A250066 A299035 A189648

Adjacent sequences: A001164 A001165 A001166 * A001168 A001169 A001170

Keyword

nonn,word

Author

N. J. A. Sloane

Extensions

Edited by N. J. A. Sloane, Jul 05 2008

a(20) and beyond from Michael S. Branicky, Jan 13 2023

Status

approved