A001166 Smallest natural number requiring n letters in English.

1, 4, 3, 11, 15, 13, 17, 24, 23, 73, 3000, 11000, 15000, 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, 73373, 101123, 101173, 101323, 101373, 103323, 103373, 111373, 113323, 113373, 117373

Offset: 3

Author

N. J. A. Sloane

Keywords

• word
• nonn

Comments

In this version 101 is written "one hundred and one", etc.

Examples

			For n = 6, the smallest natural number requiring 6 letters in English is "eleven." - _Julia Carrigan_, Jan 19 2024
		

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

• Sean A. Irvine, Illustration of terms a(3) through a(75)

Crossrefs

Cf. A000916, A014388, A045494, A045495, A080777.

Extensions

Corrected and extended by Henry Bottomley, Jan 28 2000

Further corrected and extended by Brian Galebach, Feb 06 2004

Further corrected and illustration of terms by Sean A. Irvine, Mar 12 2012