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A245218
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Decimal expansion of sup{f(n,1)}, where f(1,x) = x + 1 and thereafter f(n,x) = x + 1 if n is in A001951, else f(n,x) = 1/x.
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4
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3, 4, 3, 6, 4, 8, 4, 8, 4, 3, 0, 9, 8, 1, 3, 5, 1, 7, 8, 4, 6, 1, 0, 5, 3, 9, 0, 3, 9, 2, 4, 7, 1, 3, 5, 6, 5, 0, 0, 9, 8, 8, 1, 6, 0, 6, 7, 3, 7, 8, 3, 0, 5, 4, 3, 6, 5, 8, 6, 6, 6, 6, 0, 5, 1, 7, 6, 2, 7, 1, 0, 7, 9, 0, 7, 6, 9, 8, 6, 2, 6, 0, 4, 6, 1, 6
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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a(n)*inf{f(n,1)} = 1.
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EXAMPLE
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c = 3.43648484309813517846105390392471356500... The first 12 numbers f(n,1) comprise S(12) = {1, 2, 3, 1/3, 4/3, 7/3, 3/7, 10/7, 17/7, 24/7, 7/24, 31/24}; max(S(12)) = 24/7 = 3.42857...
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MATHEMATICA
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tmpRec = $RecursionLimit; $RecursionLimit = Infinity; u[x_] := u[x] = x + 1; d[x_] := d[x] = 1/x; r = Sqrt[2]; w = Table[Floor[k*r], {k, 2000}]; s[1] = 1; s[n_] := s[n] = If[MemberQ[w, n - 1], u[s[n - 1]], d[s[n - 1]]]; $RecursionLimit = tmpRec;
m = Max[N[Table[s[n], {n, 1, 4000}], 300]]
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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