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A287877 Start with n and repeatedly apply the powertrain map x -> A133500(x); a(n) is the fixed point that is eventually reached, or -1 if the trajectory never reaches a fixed point. 1
1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 1, 9, 0, 8, 2, 1, 1, 3, 9, 8, 8, 0, 2, 0, 0, 0, 1, 4, 1, 0, 2, 1, 0, 0, 0, 0, 1, 5, 9, 5, 0, 0, 0, 0, 0, 0, 1, 6, 2, 1, 0, 0, 0, 0, 0, 0, 1, 7, 0, 0, 0, 7, 0, 0, 0, 0, 1, 8, 0, 1, 0, 0, 0, 0, 0, 0, 1, 9, 8, 2, 0, 0, 0, 0, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is conjectured that a fixed point is always reached.

It is also conjectured that the only fixed points are the numbers 0 through 9, 2592, and 24547284284866560000000000 (see A135385).

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A133500, A135385.

Sequence in context: A330350 A222210 A177894 * A175398 A175401 A175400

Adjacent sequences:  A287874 A287875 A287876 * A287878 A287879 A287880

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 16 2017

STATUS

approved

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Last modified July 8 19:20 EDT 2020. Contains 335524 sequences. (Running on oeis4.)