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A099144
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Numbers n such that the equation S(k) = S(n+k) has no solutions for k <= n, where S is the Kempner function A002034.
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1
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OFFSET
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1,2
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COMMENTS
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No other n < 10^6. Note that n is a factorial or twice a factorial. For n = 1 and 6, there is no known k such that S(k) = S(n+k). For n = 2, 24, 48, 120, 240 and 720, the least k is respectively 16, 48, 10192, 240, 3600 and 3888.
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LINKS
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MATHEMATICA
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(*See A002034 for the Kempner function*) a=Table[Kempner[i], {i, 2000}]; lst={}; Do[i=1; While[i<=n&&a[[i]] != a[[i+n]], i++ ]; If[i>n, AppendTo[lst, n]], {n, 1000}]; lst
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CROSSREFS
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Cf. A099143 (least k such that S(k) = S(k+n)).
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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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