A001619 Number of letters in English name for n increases at these numbers.

1, 3, 11, 13, 17, 21, 23, 73, 101, 103, 111, 113, 117, 121, 123, 173, 323, 373, 1103, 1111, 1113, 1117, 1121, 1123, 1173, 1323, 1373, 3323, 3373, 11373, 13323, 13373, 17373, 21373, 23323, 23373, 73373, 101173, 101323, 101373, 103323, 103373

Offset

1,2

Comments

"and" is used in number names and "-" is counted as a letter (e.g., "twenty-one" has more letters than "seventeen").

Links

Table of n, a(n) for n=1..42.

Sean A. Irvine, Number names for terms in the sequence

Crossrefs

Sequence in context: A175820 A127209 A052362 * A071197 A191067 A052363

Adjacent sequences: A001616 A001617 A001618 * A001620 A001621 A001622

Keyword

word,nonn

Author

N. J. A. Sloane

Extensions

Missing terms added by Sean A. Irvine, Oct 04 2012

Status

approved