A084390 a(n) is the smallest positive integer > a(n-1) with exactly n letters when spelled in English.

1, 4, 7, 11, 15, 18, 21, 24, 27, 73, 101, 104, 107, 111, 115, 118, 121, 124, 127, 173, 323, 373, 1104, 1107, 1111, 1115, 1118, 1121, 1124, 1127, 1173, 1323, 1373, 3323, 3373, 11373, 13323, 13373, 17373, 23323, 23373, 73373, 101373, 103323, 103373, 111373

Offset

3,2

Comments

This uses the conventions that "and" is never used and two-digit numbers are not used before "hundred". The sequence is labeled "finite" because there is no widely accepted naming convention for arbitrarily large numbers. - David Wasserman, Dec 20 2004

Links

Table of n, a(n) for n=3..48.

Andrew Bolt et al., Maths fun, rec.puzzles group.

jaysmith et al., Number sequence - spot the pattern, rec.puzzles group.

Wikipedia, English numerals

Example

a(5) = 7 because 'seven' has 5 letters.

Crossrefs

Cf. A080777.

Sequence in context: A267049 A310735 A003670 * A101741 A247432 A310736

Adjacent sequences: A084387 A084388 A084389 * A084391 A084392 A084393

Keyword

easy,nonn,word,fini

Author

James Ong (blackshadowshade(AT)yahoo.com.au), Jun 27 2003

Extensions

More terms from David Wasserman, Dec 20 2004

Status

approved