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A022332
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Exponent of 2 (value of i) in n-th number of form 2^i*5^j.
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3
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0, 1, 2, 0, 3, 1, 4, 2, 0, 5, 3, 1, 6, 4, 2, 0, 7, 5, 3, 1, 8, 6, 4, 2, 9, 0, 7, 5, 3, 10, 1, 8, 6, 4, 11, 2, 9, 0, 7, 5, 12, 3, 10, 1, 8, 6, 13, 4, 11, 2, 9, 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9, 16, 0, 7, 14, 5, 12, 3, 10, 17, 1, 8, 15, 6, 13, 4, 11, 18, 2, 9, 16, 0, 7, 14, 5, 12, 19, 3, 10
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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MAPLE
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end proc:
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MATHEMATICA
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s = {}; m = 12; Do[n = 5^k; While[n <= 5^m, AppendTo[s, n]; n *= 2], {k, 0, m}]; IntegerExponent[#, 2] & /@ Union[s]
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PROG
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(PARI) lista(nn) = {vec = vector(nn, i , i); subset = select(n->(n/(2^valuation(n, 2)*5^valuation(n, 5)) == 1), vec); for (i = 1, #subset, print1(valuation(subset[i], 2), ", "); ); } \\ Michel Marcus, Oct 01 2013
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CROSSREFS
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KEYWORD
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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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