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A084390 a(n) is the smallest positive integer > a(n-1) with exactly n letters when spelled in English. 3
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified March 19 23:02 EDT 2019. Contains 321343 sequences. (Running on oeis4.)