A180633 - cp's OEIS frontend

A180633 a(n) is the number of iterations of function f(x) = phi(x)-1 needed before zero is reached, when starting from the initial value x = n.

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	2
7	4
8	3
9	4
10	3
11	5
12	3
13	6
14	4
15	5
16	5
17	6
18	4
19	7
20	5
21	6
22	5
23	7
24	5
25	8
26	6
27	7
28	6
29	8
30	5
31	9
32	6
33	8
34	6
35	8
36	6
37	9
38	7
39	8
40	6
41	9
42	6
43	10
44	8
45	8
46	7
47	9
48	6
49	10
50	8
51	10
52	8
53	11
54	7
55	9
56	8
57	9
58	8
59	10
60	6
61	11
62	9
63	9
64	10
65	10
66	8
67	11
68	10
69	11
70	8
71	12
72	8
73	13
74	9
75	9
76	9
77	11
78	8
79	12
80	10
81	12
82	9
83	13
84	8
85	10
86	10
87	10
88	9
89	11
90	8
91	13
92	11

[0, 1, 1, 2, 2, 3, 2, 4, 3, 4, 3, 5, 3, 6, 4, 5, 5, 6, 4, 7, 5, 6, 5, 7, 5, 8, 6, 7, 6, 8, 5, 9, 6, 8, 6, 8, 6, 9, 7, 8, 6, 9, 6, 10, 8, 8, 7, 9, 6, 10, 8, 10, 8, 11, 7, 9, 8, 9, 8, 10, 6, 11, 9, 9, 10, 10, 8, 11, 10, 11, 8, 12, 8, 13, 9, 9, 9, 11, 8, 12, 10, 12, 9, 13, 8, 10, 10, 10, 9, 11, 8, 13, 11]

cp's OEIS Frontend

A180633 a(n) is the number of iterations of function f(x) = phi(x)-1 needed before zero is reached, when starting from the initial value x = n.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	2
7	4
8	3
9	4
10	3
11	5
12	3
13	6
14	4
15	5
16	5
17	6
18	4
19	7
20	5
21	6
22	5
23	7
24	5
25	8
26	6
27	7
28	6
29	8
30	5
31	9
32	6
33	8
34	6
35	8
36	6
37	9
38	7
39	8
40	6
41	9
42	6
43	10
44	8
45	8
46	7
47	9
48	6
49	10
50	8
51	10
52	8
53	11
54	7
55	9
56	8
57	9
58	8
59	10
60	6
61	11
62	9
63	9
64	10
65	10
66	8
67	11
68	10
69	11
70	8
71	12
72	8
73	13
74	9
75	9
76	9
77	11
78	8
79	12
80	10
81	12
82	9
83	13
84	8
85	10
86	10
87	10
88	9
89	11
90	8
91	13
92	11

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	2
7	4
8	3
9	4
10	3
11	5
12	3
13	6
14	4
15	5
16	5
17	6
18	4
19	7
20	5
21	6
22	5
23	7
24	5
25	8
26	6
27	7
28	6
29	8
30	5
31	9
32	6
33	8
34	6
35	8
36	6
37	9
38	7
39	8
40	6
41	9
42	6
43	10
44	8
45	8
46	7
47	9
48	6
49	10
50	8
51	10
52	8
53	11
54	7
55	9
56	8
57	9
58	8
59	10
60	6
61	11
62	9
63	9
64	10
65	10
66	8
67	11
68	10
69	11
70	8
71	12
72	8
73	13
74	9
75	9
76	9
77	11
78	8
79	12
80	10
81	12
82	9
83	13
84	8
85	10
86	10
87	10
88	9
89	11
90	8
91	13
92	11

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	2
7	4
8	3
9	4
10	3
11	5
12	3
13	6
14	4
15	5
16	5
17	6
18	4
19	7
20	5
21	6
22	5
23	7
24	5
25	8
26	6
27	7
28	6
29	8
30	5
31	9
32	6
33	8
34	6
35	8
36	6
37	9
38	7
39	8
40	6
41	9
42	6
43	10
44	8
45	8
46	7
47	9
48	6
49	10
50	8
51	10
52	8
53	11
54	7
55	9
56	8
57	9
58	8
59	10
60	6
61	11
62	9
63	9
64	10
65	10
66	8
67	11
68	10
69	11
70	8
71	12
72	8
73	13
74	9
75	9
76	9
77	11
78	8
79	12
80	10
81	12
82	9
83	13
84	8
85	10
86	10
87	10
88	9
89	11
90	8
91	13
92	11