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A025703
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Index of 4^n within sequence of numbers of form 4^i*6^j.
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2
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1, 2, 4, 7, 11, 15, 20, 26, 33, 40, 48, 57, 67, 78, 89, 101, 114, 128, 142, 157, 173, 190, 208, 226, 245, 265, 286, 307, 329, 352, 376, 400, 425, 451, 478, 506, 534, 563, 593, 624, 655, 687, 720, 754, 789, 824, 860, 897, 935, 973, 1012, 1052, 1093, 1135, 1177, 1220
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OFFSET
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0,2
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COMMENTS
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First differs from A025709 at a(84).
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LINKS
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FORMULA
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a(n) = n + 1 + Sum(j= 1 .. n, floor(j*log[6](4))). - Robert Israel, May 10 2015
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MAPLE
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N:= 200: # to get a(0) to a(N)
[$1..N+1] + ListTools:-PartialSums([seq(floor(j*log[6](4)), j=0..N)]); # Robert Israel, May 10 2015
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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