Number of steps for S(S(..S(n)..)) to converge, where S is the Kempner function A002034.

Terms

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