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

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

Author

N. J. A. Sloane

Keywords

• nonn
• word

Examples

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

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

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

Extensions

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

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