A097004 - cp's OEIS frontend

A097004 Function A062402(x)=phi(sigma(x)) is iterated. Starting with 2^n, the n-th power of 2, a(n) is the count of distinct terms arising in trajectory; a(n)=t(n)+c(n)=t+c, where t is the number of transient terms, c is the number of recurrent terms [in the terminal cycle].

n	a(n)
0	1
1	2
2	2
3	3
4	2
5	4
6	5
7	5
8	2
9	4
10	5
11	11
12	4
13	4
14	12
15	17
16	2
17	8
18	11
19	14
20	26
21	11
22	6
23	80
24	59
25	100
26	101
27	95
28	93
29	60
30	38
31	55
32	2

[1, 2, 2, 3, 2, 4, 5, 5, 2, 4, 5, 11, 4, 4, 12, 17, 2, 8, 11, 14, 26, 11, 6, 80, 59, 100, 101, 95, 93, 60, 38, 55, 2]