A102690 Number of n-expodigital numbers (i.e., numbers m such that m^n has exactly n decimal digits).

10, 6, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset: 1

Author

Lekraj Beedassy, Jan 21 2005

Keywords

• fini
• full
• nonn
• base

Comments

a(n) = 10 - A102691(n).

Examples

			a(6) = 3 because only the 3 numbers 7, 8 and 9 are 6-expodigital: 7^6 = 117649, 8^6 = 262144, 9^6 = 531441.
		

Crossrefs

Cf. A102691.

Main diagonal of A216653.

Extensions

Edited by Charles R Greathouse IV, Aug 03 2010