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A276836
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Denominator of modified von Mangoldt function defined recursively.
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2
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1, 1, 1, 1, 1, 2, 1, 3, 1, 4, 3, 5, 1, 6, 1, 7, 15, 2, 1, 9, 1, 5, 21, 11, 1, 2, 5, 13, 9, 7, 1, 15, 1, 8, 11, 17, 35, 27, 1, 19, 39, 5, 1, 7, 1, 44, 45, 69, 1, 54, 7, 125, 17, 39, 1, 27, 55, 14, 57, 116
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OFFSET
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1,6
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COMMENTS
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LINKS
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FORMULA
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t(1, 1) = 1, t(n, k) = if(n/k = 2 then 2 else if(and(k == 1, n >= 3), n/(Product_{i = 1..n-1} t(n, k + i))/(Product_{i = 1..n-1} t(n, k + i)) else if(mod(n, k) = 0 then t(n/k, 1) else 1) else 1)).
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MATHEMATICA
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Clear[t]; nn = 60; t[1, 1] = 1; t[n_, k_] := t[n, k] = If[n/k == 2, 2, If[And[k == 1, n >= 3], n/Product[t[n, k + i], {i, 1, n - 1}]/Product[t[n - 2, k + i], {i, 1, n - 1}], If[Mod[n, k] == 0, t[n/k, 1], 1], 1]]; a = Table[t[n, 1], {n, 1, nn}]; Numerator[a]; Denominator[a]
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CROSSREFS
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KEYWORD
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nonn,frac,more
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AUTHOR
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STATUS
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approved
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