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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
1, 4, 8, 14641, 229345007, 9474296896, 886899938586555644327, 1968149944695589999318735995870695144816896, 29733387998758905886191953999849859976998299361889769463896694547608377966796875
OFFSET
1,2
COMMENTS
Are there members with digit sum other than 2^n?
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
KEYWORD
hard,nonn,base
AUTHOR
Amarnath Murthy, Apr 04 2002
EXTENSIONS
Corrected and extended by David Wasserman, Apr 23 2003
STATUS
approved