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

A031349

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

Terms

    a(0) =0a(1) =4a(2) =5a(3) =4a(4) =3a(5) =4a(6) =4a(7) =3a(8) =3a(9) =1a(10) =1a(11) =4a(12) =5a(13) =4a(14) =3a(15) =4a(16) =4a(17) =3a(18) =3a(19) =1a(20) =4a(21) =4a(22) =4a(23) =3a(24) =2a(25) =3a(26) =4a(27) =2a(28) =3a(29) =1

External references