A060607 Length of iteration chain of phi[p(n)] needed to reach 1; initial value = p(n) is the n-th prime.

1, 2, 3, 3, 4, 4, 5, 4, 5, 5, 5, 5, 6, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 6, 7, 6, 7, 8, 7, 7, 7, 7, 6, 8, 7, 8, 7, 7, 8, 7, 7, 7, 7, 8, 7, 8, 8, 8, 8, 9, 8, 8, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 8, 8, 7, 8, 9, 8, 9, 9, 8, 8, 8, 8, 8, 9, 9, 8, 9, 8, 9, 9, 7, 8, 9, 9, 8, 9, 8, 8, 8, 9, 9, 9, 8