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A306938
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If n is divisible by 3 then a(n) = n/3 otherwise a(n) = floor(n*sqrt(3)).
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5
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1, 3, 1, 6, 8, 2, 12, 13, 3, 17, 19, 4, 22, 24, 5, 27, 29, 6, 32, 34, 7, 38, 39, 8, 43, 45, 9, 48, 50, 10, 53, 55, 11, 58, 60, 12, 64, 65, 13, 69, 71, 14, 74, 76, 15, 79, 81, 16, 84, 86, 17, 90, 91, 18, 95, 96, 19, 100, 102, 20, 105, 107, 21, 110, 112, 22
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OFFSET
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1,2
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LINKS
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H. J. J. te Riele, Iteration of number-theoretic functions, Nieuw Archief v. Wiskunde, (4) 1 (1983), 345-360. See Example III.3. [Apparently the sequence is discussed earlier in the same volume on page 80, where it is proved that under certain conditions the iterates of this function go to infinity (namely, if there are two consecutive non-multiples of 3).]
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MATHEMATICA
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a[n_] := If[Divisible[n, 3], n/3, Floor[n*Sqrt[3]]]; Array[a, 66] (* Amiram Eldar, Mar 17 2019 *)
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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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