A126260 - cp's OEIS frontend

A126260 Irregular triangle read by rows where row n contains the positive integers k, k<=n, where every positive integer <=k and coprime to k is also coprime to n.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	4
10	1
11	2
12	3
13	4
14	5
15	1
16	2
17	6
18	1
19	2
20	3
21	4
22	5
23	6
24	7
25	1
26	2
27	4
28	6
29	8
30	1
31	2
32	3
33	6
34	9
35	1
36	2
37	4
38	10
39	1
40	2
41	3
42	4
43	5
44	6
45	7
46	8
47	9
48	10
49	11
50	1
51	2
52	6
53	12
54	1
55	2
56	3
57	4
58	5
59	6
60	7
61	8
62	9
63	10
64	11
65	12
66	13
67	1
68	2
69	4
70	6
71	14
72	1
73	2
74	3
75	15
76	1
77	2
78	4
79	6
80	8
81	10
82	12
83	14
84	16
85	1
86	2
87	3
88	4
89	5
90	6
91	7
92	8
93	9
94	10
95	11
96	12

[1, 1, 2, 1, 2, 3, 1, 2, 4, 1, 2, 3, 4, 5, 1, 2, 6, 1, 2, 3, 4, 5, 6, 7, 1, 2, 4, 6, 8, 1, 2, 3, 6, 9, 1, 2, 4, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 6, 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 4, 6, 14, 1, 2, 3, 15, 1, 2, 4, 6, 8, 10, 12, 14, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

cp's OEIS Frontend

A126260 Irregular triangle read by rows where row n contains the positive integers k, k<=n, where every positive integer <=k and coprime to k is also 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	4
10	1
11	2
12	3
13	4
14	5
15	1
16	2
17	6
18	1
19	2
20	3
21	4
22	5
23	6
24	7
25	1
26	2
27	4
28	6
29	8
30	1
31	2
32	3
33	6
34	9
35	1
36	2
37	4
38	10
39	1
40	2
41	3
42	4
43	5
44	6
45	7
46	8
47	9
48	10
49	11
50	1
51	2
52	6
53	12
54	1
55	2
56	3
57	4
58	5
59	6
60	7
61	8
62	9
63	10
64	11
65	12
66	13
67	1
68	2
69	4
70	6
71	14
72	1
73	2
74	3
75	15
76	1
77	2
78	4
79	6
80	8
81	10
82	12
83	14
84	16
85	1
86	2
87	3
88	4
89	5
90	6
91	7
92	8
93	9
94	10
95	11
96	12

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	4
10	1
11	2
12	3
13	4
14	5
15	1
16	2
17	6
18	1
19	2
20	3
21	4
22	5
23	6
24	7
25	1
26	2
27	4
28	6
29	8
30	1
31	2
32	3
33	6
34	9
35	1
36	2
37	4
38	10
39	1
40	2
41	3
42	4
43	5
44	6
45	7
46	8
47	9
48	10
49	11
50	1
51	2
52	6
53	12
54	1
55	2
56	3
57	4
58	5
59	6
60	7
61	8
62	9
63	10
64	11
65	12
66	13
67	1
68	2
69	4
70	6
71	14
72	1
73	2
74	3
75	15
76	1
77	2
78	4
79	6
80	8
81	10
82	12
83	14
84	16
85	1
86	2
87	3
88	4
89	5
90	6
91	7
92	8
93	9
94	10
95	11
96	12

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	4
10	1
11	2
12	3
13	4
14	5
15	1
16	2
17	6
18	1
19	2
20	3
21	4
22	5
23	6
24	7
25	1
26	2
27	4
28	6
29	8
30	1
31	2
32	3
33	6
34	9
35	1
36	2
37	4
38	10
39	1
40	2
41	3
42	4
43	5
44	6
45	7
46	8
47	9
48	10
49	11
50	1
51	2
52	6
53	12
54	1
55	2
56	3
57	4
58	5
59	6
60	7
61	8
62	9
63	10
64	11
65	12
66	13
67	1
68	2
69	4
70	6
71	14
72	1
73	2
74	3
75	15
76	1
77	2
78	4
79	6
80	8
81	10
82	12
83	14
84	16
85	1
86	2
87	3
88	4
89	5
90	6
91	7
92	8
93	9
94	10
95	11
96	12