1,3

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

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

Sequence in context: A007496 A082274 A029804 this_sequence A072794 A119257 A102455

Adjacent sequences: A084687 A084688 A084689 this_sequence A084691 A084692 A084693

fini,nonn,full

Zak Seidov (zakseidov(AT)yahoo.com), Jul 01 2003