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Search: id:A051802
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| A051802 |
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Nonzero multiplicative digital root of n. |
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+0
34
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| 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 2, 4, 6, 8, 1, 2, 4, 6, 8, 3, 3, 6, 9, 2, 5, 8, 2, 8, 4, 4, 4, 8, 2, 6, 2, 8, 6, 6, 8, 5, 5, 1, 5, 2, 1, 3, 5, 4, 2, 6, 6, 2, 8, 8, 3, 8, 8, 6, 2, 7, 7, 4, 2, 6, 5, 8, 8, 3, 8, 8, 8, 6, 8, 6, 4, 6, 3, 8, 4, 9, 9, 8, 4, 8, 2, 2, 8, 4, 8, 1, 1, 2, 3, 4
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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Discussed Jun 15 1991 on sci.math by Mayne, Rusin, Landrum et al.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..1000
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FORMULA
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If n==A051801(n) then n else a(A051801(n)).
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MATHEMATICA
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mdr0[n_] := NestWhile[Times @@ (IntegerDigits@# /. 0 -> 1) &, n, UnsameQ, All]; Table[ mdr0@n, {n, 0, 104}] - Robert G. Wilson v (rgwv(at)rgwv.com), Aug 04 2006
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CROSSREFS
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Uses A051801.
Sequence in context: A054055 A067456 A052429 this_sequence A051801 A071205 A066750
Adjacent sequences: A051799 A051800 A051801 this_sequence A051803 A051804 A051805
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KEYWORD
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nonn,easy,base,nice
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AUTHOR
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Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999
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EXTENSIONS
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Occasionally defined with a(0)=0.
More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Aug 04 2006
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