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A007906 Number of steps for aliquot sequence for n to converge to 1, or 0 if it never reaches 1. +0
10
1, 2, 2, 3, 2, 0, 2, 3, 4, 4, 2, 7, 2, 5, 5, 6, 2, 4, 2, 7, 3, 6, 2, 5, 0, 7, 3, 0, 2, 15, 2, 3, 6, 8, 3, 4, 2, 7, 3, 4, 2, 14, 2, 5, 7, 8, 2, 6, 4, 3, 4, 9, 2, 13, 3, 5, 3, 4, 2, 11, 2, 9, 3, 4, 3, 12, 2, 5, 4, 6, 2, 9, 2, 5, 5, 5, 3, 11, 2, 7, 5, 6, 2, 6, 3, 9, 7, 7, 2, 10, 4, 6, 4, 4, 0, 9, 2, 3 (list; graph; listen)
OFFSET

1,2

COMMENT

Length of transient part of trajectory of n if trajectory reaches 1, otherwise a(n) = 0. See A098008 for a better version. See A098007 for further information.

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, B6.

R. K. Guy and J. L. Selfridge, Interim report on aliquot series, pp. 557-580 of Proceedings Manitoba Conference on Numerical Mathematics. University of Manitoba, Winnipeg, Oct 1971.

CROSSREFS

Cf. A098008, A098007, A044050, A003023.

Sequence in context: A096226 A016539 A022461 this_sequence A098008 A127638 A127639

Adjacent sequences: A007903 A007904 A007905 this_sequence A007907 A007908 A007909

KEYWORD

nonn

AUTHOR

Michael Gerenrot (sch116(AT)yahoo.com)

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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