A375478 - cp's OEIS frontend

A375478 Irregular triangle read by rows in which row n lists the iterates of the phi(x) map from n to 1, where phi(x) is Euler's totient function (A000010).

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

[1, 2, 1, 3, 2, 1, 4, 2, 1, 5, 4, 2, 1, 6, 2, 1, 7, 6, 2, 1, 8, 4, 2, 1, 9, 6, 2, 1, 10, 4, 2, 1, 11, 10, 4, 2, 1, 12, 4, 2, 1, 13, 12, 4, 2, 1, 14, 6, 2, 1, 15, 8, 4, 2, 1, 16, 8, 4, 2, 1, 17, 16, 8, 4, 2, 1, 18, 6, 2, 1, 19, 18, 6, 2, 1, 20, 8, 4, 2, 1, 21, 12, 4, 2, 1]

cp's OEIS Frontend

A375478 Irregular triangle read by rows in which row n lists the iterates of the phi(x) map from n to 1, where phi(x) is Euler's totient function (A000010).

Table of values

List of values

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

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

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