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A031353 7-multiplicative persistence: number of iterations of "multiply 7th powers of digits" needed to reach 0 or 1. 1
0, 4, 3, 3, 3, 3, 3, 2, 3, 1, 1, 4, 3, 3, 3, 3, 3, 2, 3, 1, 4, 3, 3, 2, 2, 2, 2, 3, 2, 1, 3, 3, 3, 2, 2, 2, 2, 3, 2, 1, 3, 2, 2, 3, 2, 3, 3, 3, 2, 1, 3, 2, 2, 2, 2, 2, 3, 2, 3, 1, 3, 2, 2, 3, 2, 2, 2, 2, 2, 1, 3, 2, 2, 3, 3, 2, 2, 2, 2, 1, 2, 3, 3, 3, 2, 2, 2, 2, 2, 1, 3, 2, 2, 2, 3, 2, 2, 2, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Multiplicative Persistence
CROSSREFS
Sequence in context: A239884 A143487 A031350 * A356764 A085415 A187470
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Offset 1 from Seiichi Manyama, Jan 13 2020
STATUS
approved

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Last modified May 27 11:08 EDT 2024. Contains 372858 sequences. (Running on oeis4.)