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A090636
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Trajectory of 15 under the map k -> A003415(k) (taking the arithmetic derivative).
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6
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15, 8, 12, 16, 32, 80, 176, 368, 752, 1520, 3424, 8592, 20096, 70464, 235072, 705280, 3023616, 13223680, 55540736, 278539264, 1392697344, 9541095424, 58609614848, 410267320320, 3397142953984, 24143851798528, 176071227916288, 1232666139967488
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OFFSET
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1,1
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LINKS
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FORMULA
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PROG
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(Haskell)
a090636 n = a090636_list !! (n-1)
(PARI) A090636(n, a=15)={if(n<0, vector(-n, n, if(n>1, a=A003415(a), a)), for(n=2, n, a=A003415(a)); a)} \\ For n<0 return the vector a[1..-n]. - M. F. Hasler, Nov 27 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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EXTENSIONS
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STATUS
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approved
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