References to A082381

Sequence of the squared digital root of a number until 1 or 4 is reached. The initial numbers 1,2,..n are not output.
1, 4, 9, 81, 65, 61, 37, 58, 89, 145, 42, 20, 4, 16, 37, 58, 89, 145, 42, 20, 4, 25, 29, 85

1 seqfan posts