Number of iterations until n reaches 1 or 4 under x goes to sum of squares of digits map.

Terms

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