A082655 Number of distinct letters needed to spell English names of numbers 1 through n.

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

Author

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

Keywords

• nonn
• word
• easy

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.

Examples

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

Crossrefs

Cf. A005589, A052360, A052362, A052363.

Extensions

Edited by Don Reble, Nov 03 2003

More terms from Jinyuan Wang, Apr 07 2020