1,3

There are exactly 9 such n's that 4^n uses only distinct digits.

Table of n, a(n) for n=1..9.

10 is (the last!) term because 4^10=1048576 uses only distinct digits.

Sequence in context: A007496 A082274 A029804 * A194963 A072794 A181820

Adjacent sequences: A084687 A084688 A084689 * A084691 A084692 A084693

fini,nonn,full,base

Zak Seidov, Jul 01 2003

approved