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Search: id:A069647
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| A069647 |
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a(1) = 1 and then the smallest n-th power with the digit sum also a nontrivial n-th power. i.e. 10^n is not a member. |
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2
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| 1, 4, 8, 14641, 229345007, 9474296896, 886899938586555644327, 1968149944695589999318735995870695144816896, 29733387998758905886191953999849859976998299361889769463896694547608377966796875
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Are there members with digit sum other than 2^n ?
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EXAMPLE
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a(4) = 14641 because 14641 is 11^4, and its digit sum is 16, which is 2^4.
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CROSSREFS
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Cf. A069648.
Sequence in context: A013445 A009511 A069883 this_sequence A011348 A021208 A021675
Adjacent sequences: A069644 A069645 A069646 this_sequence A069648 A069649 A069650
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KEYWORD
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hard,nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 04 2002
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EXTENSIONS
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Corrected and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Apr 23 2003
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