

A082655


Number of distinct letters needed to spell English names of numbers 1 through n.


0



3, 5, 7, 9, 11, 13, 13, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16
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OFFSET

1,1


COMMENTS

Late increases are at twentY, hunDred, thousAnd, Million, Billion, Quadrillion, sePtillion, oCtillion.
Only J and K are never used for English number names. Z is used only for zero.


LINKS

Table of n, a(n) for n=1..66.


EXAMPLE

"One" has three letters, "two" brings two new letters (t w), "three" brings two more (h r)...


CROSSREFS

Cf. A005589, A052360, A052362, A052363.
Sequence in context: A187687 A056617 A213924 * A050828 A329405 A194391
Adjacent sequences: A082652 A082653 A082654 * A082656 A082657 A082658


KEYWORD

nonn,word,easy


AUTHOR

Peter F. Klammer (pklammer(AT)acm.org), May 17 2003


EXTENSIONS

Edited by Don Reble, Nov 03 2003
More terms from Jinyuan Wang, Apr 07 2020


STATUS

approved



