A133994 - cp's OEIS frontend

A133994 Irregular array read by rows: n-th row contains (in numerical order) both the positive integers <= n that are divisors of n and those that are coprime to n.

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

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

cp's OEIS Frontend

A133994 Irregular array read by rows: n-th row contains (in numerical order) both the positive integers <= n that are divisors of n and those that are coprime to n.

Table of values

List of values

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

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

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