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3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1.
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%I #12 Jan 12 2020 23:45:17

%S 0,4,5,4,3,4,4,3,3,1,1,4,5,4,3,4,4,3,3,1,4,4,4,3,2,3,4,2,3,1,5,4,3,3,

%T 4,3,4,3,4,1,4,3,3,2,2,3,3,3,3,1,3,2,4,2,3,2,3,2,3,1,4,3,3,3,2,3,2,2,

%U 3,1,4,4,4,3,3,2,4,3,2,1,3,2,3,3,2,2,3,3,3,1,3,3,4,3,3,3,2,3,3

%N 3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1.

%H Seiichi Manyama, <a href="/A031349/b031349.txt">Table of n, a(n) for n = 1..10000</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/MultiplicativePersistence.html">Multiplicative Persistence</a>

%K nonn,base

%O 1,2

%A _Eric W. Weisstein_