A164793 a(n) is the smallest number whose English name has the letter "i" in the n-th position, or -1 if no such number exists.

-1, 5, 13, -1, 1000000, 4000000, 45, 25, 75, 13000000, 17000000, 105, 113, 305, 313, 3013, 145, 125, 175, 325, 375, 3075, 1105, 1113, 1305, 1313, 3305, 1145, 1125, 1175, 1325, 1375, 3325, 3375, 11375, 13325, 13375, 17375, 23325, 23375, 73375, 101375, 103325

Offset: 1

Author

Claudio Meller, Aug 26 2009

Keywords

• word
• sign

Comments

Original definition used "-2 for infinite".

Examples

			a(2)=5 ("fIve"), a(3)=13 ("thIrteen"), a(5)=10^6 ("onemIllion").
		

Crossrefs

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

Cf. A164794 ("f"), A164795 ("h"), A164796 ("r"), A164797 ("u").

Extensions

a(11) and beyond from Michael S. Branicky, Feb 02 2021

Name changed to remove "-2" (see Comments), and a(1) and a(4) changed from -2 to -1 by Jon E. Schoenfield, Feb 02 2021