Periods of sum of 6th powers of digits iterated until the sequence becomes periodic.

Terms

a(0) =1a(1) =1a(2) =10a(3) =30a(4) =30a(5) =30a(6) =10a(7) =10a(8) =10a(9) =3a(10) =1a(11) =10a(12) =10a(13) =3a(14) =10a(15) =10a(16) =30a(17) =10a(18) =30a(19) =10a(20) =10a(21) =10a(22) =30a(23) =10a(24) =10a(25) =10a(26) =10a(27) =10a(28) =10a(29) =30