Number of iterations required to reach stationary value when repeatedly applying d, the number of divisors function (A000005).

A036459

Number of iterations required to reach stationary value when repeatedly applying d, the number of divisors function (A000005).

Terms

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

External references