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A068671
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Define f(n,k) = floor[n/k] and a(n) = right concatenation of f(n,k) for k = 1 to int[(n+1)/2] or until one arrives at a 1.
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1
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1, 21, 31, 421, 521, 6321, 7321, 84221, 94321, 1053221, 1153221, 12643221, 13643221, 147432221, 157533221, 1685432221, 1785432221, 18964332221, 19964332221, 2010654322221, 2110754332221, 22117543322221, 23117543322221
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(13) = 13643221. as int[13/6] =2, floor[13/7] = 1 hence floor [13/8]=1 etc. are not used in the concatenation.
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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_Amarnath Murthy_, Mar 02 2002
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STATUS
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approved
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