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A096737
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a(1) = 2; for n>1: a(n) = integer part of y-value when x=0 in (y-tau(n))/(x-1)=(1-tau(n))/(n-1), tau=A000005.
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2
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2, 3, 2, 3, 2, 4, 2, 4, 3, 4, 2, 6, 2, 4, 4, 5, 2, 6, 2, 6, 4, 4, 2, 8, 3, 4, 4, 6, 2, 8, 2, 6, 4, 4, 4, 9, 2, 4, 4, 8, 2, 8, 2, 6, 6, 4, 2, 10, 3, 6, 4, 6, 2, 8, 4, 8, 4, 4, 2, 12, 2, 4, 6, 7, 4, 8, 2, 6, 4, 8, 2, 12, 2, 4, 6, 6, 4, 8, 2, 10, 5, 4, 2, 12, 4, 4, 4, 8, 2, 12, 4, 6, 4, 4, 4, 12, 2, 6, 6
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OFFSET
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1,1
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COMMENTS
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a(n) = 2 iff n is prime.
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LINKS
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FORMULA
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a(n) = floor((n*tau(n)-1)/(n-1))for n>1, a(1) = 2.
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EXAMPLE
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MATHEMATICA
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Join[{2, 3}, Table[Floor[(n*DivisorSigma[0, n] - 1)/(n - 1)], {n, 3, 100}]] (* G. C. Greubel, Nov 27 2016 *)
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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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