Periods of sum of squares of digits iterated until the sequence becomes periodic.

Terms

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