A031353 7-multiplicative persistence: number of iterations of "multiply 7th powers of digits" needed to reach 0 or 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

Offset

1,2

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Multiplicative Persistence

Crossrefs

Sequence in context: A239884 A143487 A031350 * A356764 A085415 A187470

Adjacent sequences: A031350 A031351 A031352 * A031354 A031355 A031356

Keyword

nonn,base

Author

Eric W. Weisstein

Extensions

Offset 1 from Seiichi Manyama, Jan 13 2020

Status

approved