A176839 - cp's OEIS frontend

A176839 The number of iterations to reach 1 under the map x -> x-tau(phi(x)), starting at n.

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

[0, 1, 1, 2, 2, 3, 2, 3, 3, 3, 3, 4, 3, 4, 4, 5, 5, 5, 4, 6, 5, 6, 5, 7, 5, 7, 6, 7, 6, 8, 6, 7, 7, 7, 7, 9, 8, 8, 7, 8, 8, 10, 8, 9, 9, 11, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 10, 11, 11, 12, 11, 12, 12, 12, 12, 12, 12, 13, 11, 12, 13, 13, 12, 13, 13, 13, 12, 13, 14, 14, 14]

cp's OEIS Frontend

A176839 The number of iterations to reach 1 under the map x -> x-tau(phi(x)), starting at n.

Table of values

List of values

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

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

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