A069647 a(1) = 1; for n > 1, the smallest n-th power with the digit sum also a nontrivial n-th power, i.e., 10^n is not a member.

1, 4, 8, 14641, 229345007, 9474296896, 886899938586555644327, 1968149944695589999318735995870695144816896, 29733387998758905886191953999849859976998299361889769463896694547608377966796875

Offset

1,2

Comments

Are there members with digit sum other than 2^n?

Links

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

Example

a(4) = 14641 because 14641 is 11^4 and its digit sum is 16, which is 2^4.

Crossrefs

Cf. A069648.

Sequence in context: A009511 A057841 A069883 * A011348 A198554 A200413

Adjacent sequences: A069644 A069645 A069646 * A069648 A069649 A069650

Keyword

hard,nonn,base

Author

Amarnath Murthy, Apr 04 2002

Extensions

Corrected and extended by David Wasserman, Apr 23 2003

Status

approved