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Search: id:A118872
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| A118872 |
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Numbers n such that digit sum of 3^n is a power of 3. |
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+0
1
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| 0, 1, 2, 3, 4, 5, 9, 10, 11, 13, 16, 17, 21, 27, 31, 35, 36, 39, 114, 119, 973, 1005, 1010, 1025, 3006, 3029, 3040, 9128, 9215, 9227, 9316, 27431, 27442, 27515, 27519, 27554, 82632, 82746, 82763, 82784, 83111, 246838, 247206, 247388, 247406, 247447
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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a(46) > 677750. - Chandler
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EXAMPLE
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3^39 = 4052555153018976267 with digit sum 81 = 3^4.
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MATHEMATICA
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Do[If[IntegerQ[Log[3, Plus @@ IntegerDigits[3^n]]], Print[n]], {n, 0, 677750}];
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CROSSREFS
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Cf. A004166 Sum of digits of 3^n.
Sequence in context: A032969 A095906 A118732 this_sequence A046029 A139456 A081869
Adjacent sequences: A118869 A118870 A118871 this_sequence A118873 A118874 A118875
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), May 24 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 16 2006
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