Periods of sum of 9th powers of digits iterated until the sequence becomes periodic.

Terms

a(0) =1a(1) =1a(2) =30a(3) =93a(4) =1a(5) =19a(6) =80a(7) =4a(8) =30a(9) =80a(10) =1a(11) =30a(12) =93a(13) =4a(14) =10a(15) =80a(16) =24a(17) =30a(18) =80a(19) =28a(20) =30a(21) =93a(22) =8a(23) =30a(24) =80a(25) =28a(26) =19a(27) =93a(28) =8a(29) =30