A378638 - cp's OEIS frontend

A378638 Irregular triangle read by rows: row n lists all m such that phi(m) divides n, where phi is the Euler totient function (A000010).

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

[1, 2, 1, 2, 3, 4, 6, 1, 2, 1, 2, 3, 4, 5, 6, 8, 10, 12, 1, 2, 1, 2, 3, 4, 6, 7, 9, 14, 18, 1, 2, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 1, 2, 1, 2, 3, 4, 6, 11, 22, 1, 2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 18, 21, 26, 28, 36, 42, 1, 2, 1, 2, 3, 4, 6, 1, 2]

cp's OEIS Frontend

A378638 Irregular triangle read by rows: row n lists all m such that phi(m) divides n, where phi is the Euler totient function (A000010).

Table of values

List of values

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

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

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