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