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A063562
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Smallest k such that 3^k has exactly n 7's in its decimal representation.
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0
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1, 3, 23, 11, 47, 41, 50, 100, 123, 90, 174, 112, 179, 172, 201, 233, 168, 146, 211, 280, 247, 330, 294, 369, 411, 390, 401, 451, 374, 344, 448, 468, 516, 501, 536, 559, 574, 498, 523, 577, 662, 678, 722, 618, 615, 833, 686, 782, 717, 794, 707
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listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..50.
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MATHEMATICA
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a = {}; Do[k = 1; While[ Count[ IntegerDigits[3^k], 7] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
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CROSSREFS
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Sequence in context: A285098 A088605 A272816 * A130475 A212998 A157819
Adjacent sequences: A063559 A063560 A063561 * A063563 A063564 A063565
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v, Aug 10 2001
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EXTENSIONS
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Name corrected by Jon E. Schoenfield, Jun 26 2018
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STATUS
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approved
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