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A031351 5-multiplicative persistence: number of iterations of "multiply 5th powers of digits" needed to reach 0 or 1. 1
0, 4, 4, 2, 3, 3, 2, 3, 2, 1, 1, 4, 4, 2, 3, 3, 2, 3, 2, 1, 4, 2, 3, 3, 2, 4, 3, 2, 3, 1, 4, 3, 2, 4, 3, 3, 2, 3, 2, 1, 2, 3, 4, 2, 2, 3, 2, 3, 2, 1, 3, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 4, 3, 3, 2, 2, 2, 2, 2, 1, 2, 3, 2, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3, 3, 2, 2, 2, 2, 3, 1, 2, 3, 2, 2, 3, 2, 3, 3, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Multiplicative Persistence
CROSSREFS
Sequence in context: A276149 A146899 A317726 * A068923 A222295 A371706
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified May 23 04:41 EDT 2024. Contains 372758 sequences. (Running on oeis4.)