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

1,1

Comments

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

Links

Table of n, a(n) for n=1..21.

Example

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.

Sequence in context: A094175 A193952 A158508 * A076366 A304879 A105155

Adjacent sequences: A102687 A102688 A102689 * A102691 A102692 A102693

Keyword

fini,full,nonn,base

Author

Lekraj Beedassy, Jan 21 2005

Extensions

Edited by Charles R Greathouse IV, Aug 03 2010

Status

approved