A364631 - cp's OEIS frontend

A364631 a(n) is the number of iterations of phi(psi(x)) starting at x = n and terminating when psi(phi(x)) = x (n is counted), -1 otherwise.

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	3
12	4
13	4
14	4
15	4
16	4
17	4
18	5
19	4
20	5
21	5
22	5
23	4
24	5
25	4
26	5
27	5
28	5
29	4
30	6
31	5
32	5
33	5
34	6
35	5
36	6
37	6
38	5
39	6
40	6
41	5
42	6
43	6
44	6
45	6
46	6
47	5
48	6
49	6
50	6
51	6
52	6
53	6
54	7
55	6
56	6
57	6
58	6
59	5
60	7
61	7
62	6
63	6
64	6
65	6
66	7
67	6
68	7
69	6
70	7
71	6
72	7
73	7
74	7
75	6
76	6
77	6
78	7
79	6
80	7
81	7
82	7
83	6
84	7
85	7
86	7
87	6
88	7

[1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 3, 4, 4, 4, 4, 4, 4, 5, 4, 5, 5, 5, 4, 5, 4, 5, 5, 5, 4, 6, 5, 5, 5, 6, 5, 6, 6, 5, 6, 6, 5, 6, 6, 6, 6, 6, 5, 6, 6, 6, 6, 6, 6, 7, 6, 6, 6, 6, 5, 7, 7, 6, 6, 6, 6, 7, 6, 7, 6, 7, 6, 7, 7, 7, 6, 6, 6, 7, 6, 7, 7, 7, 6, 7, 7, 7, 6, 7]

cp's OEIS Frontend

A364631 a(n) is the number of iterations of phi(psi(x)) starting at x = n and terminating when psi(phi(x)) = x (n is counted), -1 otherwise.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	3
12	4
13	4
14	4
15	4
16	4
17	4
18	5
19	4
20	5
21	5
22	5
23	4
24	5
25	4
26	5
27	5
28	5
29	4
30	6
31	5
32	5
33	5
34	6
35	5
36	6
37	6
38	5
39	6
40	6
41	5
42	6
43	6
44	6
45	6
46	6
47	5
48	6
49	6
50	6
51	6
52	6
53	6
54	7
55	6
56	6
57	6
58	6
59	5
60	7
61	7
62	6
63	6
64	6
65	6
66	7
67	6
68	7
69	6
70	7
71	6
72	7
73	7
74	7
75	6
76	6
77	6
78	7
79	6
80	7
81	7
82	7
83	6
84	7
85	7
86	7
87	6
88	7

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	3
12	4
13	4
14	4
15	4
16	4
17	4
18	5
19	4
20	5
21	5
22	5
23	4
24	5
25	4
26	5
27	5
28	5
29	4
30	6
31	5
32	5
33	5
34	6
35	5
36	6
37	6
38	5
39	6
40	6
41	5
42	6
43	6
44	6
45	6
46	6
47	5
48	6
49	6
50	6
51	6
52	6
53	6
54	7
55	6
56	6
57	6
58	6
59	5
60	7
61	7
62	6
63	6
64	6
65	6
66	7
67	6
68	7
69	6
70	7
71	6
72	7
73	7
74	7
75	6
76	6
77	6
78	7
79	6
80	7
81	7
82	7
83	6
84	7
85	7
86	7
87	6
88	7

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	3
7	3
8	3
9	3
10	4
11	3
12	4
13	4
14	4
15	4
16	4
17	4
18	5
19	4
20	5
21	5
22	5
23	4
24	5
25	4
26	5
27	5
28	5
29	4
30	6
31	5
32	5
33	5
34	6
35	5
36	6
37	6
38	5
39	6
40	6
41	5
42	6
43	6
44	6
45	6
46	6
47	5
48	6
49	6
50	6
51	6
52	6
53	6
54	7
55	6
56	6
57	6
58	6
59	5
60	7
61	7
62	6
63	6
64	6
65	6
66	7
67	6
68	7
69	6
70	7
71	6
72	7
73	7
74	7
75	6
76	6
77	6
78	7
79	6
80	7
81	7
82	7
83	6
84	7
85	7
86	7
87	6
88	7