Search: id:a063603
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A063603
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Smallest k such that 6^k has exactly n 7's in its decimal representation.
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1, 7, 9, 5, 26, 35, 30, 48, 72, 60, 65, 77, 100, 127, 146, 130, 152, 150, 155, 230, 205, 192, 201, 234, 274, 255, 279, 286, 249, 297, 292, 321, 312, 331, 225, 335, 396, 342, 345, 405, 370, 385, 445, 461, 503, 442, 480, 469, 473, 518, 510
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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a = {}; Do[k = 1; While[ Count[ IntegerDigits[6^k], 7] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
Join[{1}, Flatten[With[{p6=6^Range[650]}, Table[First[Position[p6, _?(Count[ IntegerDigits[#], 7]==n&)]], {n, 55}]]]] (* Harvey P. Dale, Oct 03 2011 *)
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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