A031349 3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1.

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, 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, 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

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn
• base

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Multiplicative Persistence