A164797 a(n) is the smallest number whose English name has the letter "u" in the n-th position, or -1 if no such number exists.

-1, -1, 4, 1000000000000000000000000000000000000, 100, 400, 300, 44, 24, 74, 15000, 13000, 104, 404, 304, 4004, 1100, 144, 124, 174, 324, 374, 3024, 3074, 1104, 1404, 3404, 3304, 1144, 1124, 1174, 1324, 1374, 3324, 3374, 11374, 13324, 13374, 17374, 23324, 23374

Offset: 1

Author

Claudio Meller, Aug 26 2009

Keywords

• word
• sign

Examples

			a(3)=4 ("foUr"), a(5)=100 ("onehUndred"), a(4)=10^36 ("oneUndecillion").
		

Links

• Wikipedia, Names for large numbers.

Crossrefs

Cf. A164789 ("o"), A164790 ("e"), A164791 ("n"), A164792 ("t").

Cf. A164793 ("i"), A164794 ("f"), A164795 ("h"), A164796 ("r").

Extensions

a(4) corrected, and a(27) and beyond from Michael S. Branicky, Feb 02 2021