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
