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A074970 Number of steps to reach the first integer starting with sigma(n)/n and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached. 0
0, 1, 2, 2, 18, 0, 3, 2, 3, 3, 26, 1, 9, 3, 7, 3, 6, 3, 56, 11, 9, 15, 42, 2, 10, 3, 3, 0, 38 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(p) = A073524(p) for primes p.

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

a(26)=3 since (26+13+2+1)/26=21/13 -> 42/13 -> 168/13 -> 168.

CROSSREFS

Cf. A073524, A000203, A009194.

Sequence in context: A222451 A000528 A260478 * A297794 A291765 A231123

Adjacent sequences:  A074967 A074968 A074969 * A074971 A074972 A074973

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 05 2002

STATUS

approved

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Last modified November 19 20:42 EST 2019. Contains 329323 sequences. (Running on oeis4.)