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A082655
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Number of distinct letters needed to spell English names of numbers 1 through n.
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0
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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
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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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.
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LINKS
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Table of n, a(n) for n=1..66.
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EXAMPLE
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"One" has three letters, "two" brings two new letters (t w), "three" brings two more (h r)...
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CROSSREFS
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Cf. A005589, A052360, A052362, A052363.
Sequence in context: A187687 A056617 A213924 * A050828 A329405 A194391
Adjacent sequences: A082652 A082653 A082654 * A082656 A082657 A082658
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KEYWORD
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nonn,word,easy
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AUTHOR
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Peter F. Klammer (pklammer(AT)acm.org), May 17 2003
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EXTENSIONS
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Edited by Don Reble, Nov 03 2003
More terms from Jinyuan Wang, Apr 07 2020
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STATUS
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approved
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