5-multiplicative persistence: number of iterations of "multiply 5th powers of digits" needed to reach 0 or 1.

A031351

5-multiplicative persistence: number of iterations of "multiply 5th powers of digits" needed to reach 0 or 1.

Terms

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

External references