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A048689
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Number of classes generated by function A001222 when applied to binomial coefficients.
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1
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1, 2, 2, 2, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 7, 7, 8, 7, 7, 7, 8, 8, 8, 8, 9, 8, 9, 9, 10, 9, 10, 11, 10, 10, 11, 9, 10, 11, 11, 12, 12, 12, 12, 10, 12, 11, 12, 13, 11, 13, 14, 13, 12, 12, 13, 13, 14, 11, 14, 13, 14, 14, 12, 13, 16, 15, 14, 14, 15, 14, 16, 13, 17, 15, 14, 16
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = length(union(A001222(binomial(n,k)))), for 0 <= k <= n.
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EXAMPLE
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For n=9, A001222({C(9,k)}) = {0,2,4,4,4,4,4,4,2,0} includes 3 distinct values, thus generating 3 classes of k values: {0,9},{1,8} and {2,3,4,5,6,7}. So a(9)=3.
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MATHEMATICA
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Table[Length[Union[Table[PrimeOmega[Binomial[n, k]], {k, 0, n}]]], {n,
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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