A186972 - cp's OEIS frontend

A186972 Irregular triangle T(n,k), n>=1, 1<=k<=A186971(n), read by rows: T(n,k) is the number of k-element subsets of {1, 2, ..., n} containing n and having pairwise coprime elements.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	4
12	5
13	2
14	1
15	2
16	1
17	1
18	6
19	11
20	8
21	2
22	1
23	4
24	6
25	4
26	1
27	1
28	6
29	12
30	10
31	3
32	1
33	4
34	5
35	2
36	1
37	10
38	31
39	42
40	26
41	6
42	1
43	4
44	6
45	4
46	1
47	1
48	12
49	45
50	79
51	72
52	33
53	6
54	1
55	6
56	14
57	16
58	9
59	2
60	1
61	8
62	21
63	25
64	14
65	3
66	1
67	8
68	24
69	36
70	29
71	12
72	2
73	1
74	16
75	79
76	183
77	228
78	157
79	56
80	8
81	1
82	6
83	15
84	20
85	15
86	6
87	1

[1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 4, 5, 2, 1, 2, 1, 1, 6, 11, 8, 2, 1, 4, 6, 4, 1, 1, 6, 12, 10, 3, 1, 4, 5, 2, 1, 10, 31, 42, 26, 6, 1, 4, 6, 4, 1, 1, 12, 45, 79, 72, 33, 6, 1, 6, 14, 16, 9, 2, 1, 8, 21, 25, 14, 3, 1, 8, 24, 36, 29, 12, 2, 1, 16, 79, 183, 228, 157, 56, 8, 1, 6, 15, 20, 15, 6, 1]

cp's OEIS Frontend

A186972 Irregular triangle T(n,k), n>=1, 1<=k<=A186971(n), read by rows: T(n,k) is the number of k-element subsets of {1, 2, ..., n} containing n and having pairwise coprime elements.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	4
12	5
13	2
14	1
15	2
16	1
17	1
18	6
19	11
20	8
21	2
22	1
23	4
24	6
25	4
26	1
27	1
28	6
29	12
30	10
31	3
32	1
33	4
34	5
35	2
36	1
37	10
38	31
39	42
40	26
41	6
42	1
43	4
44	6
45	4
46	1
47	1
48	12
49	45
50	79
51	72
52	33
53	6
54	1
55	6
56	14
57	16
58	9
59	2
60	1
61	8
62	21
63	25
64	14
65	3
66	1
67	8
68	24
69	36
70	29
71	12
72	2
73	1
74	16
75	79
76	183
77	228
78	157
79	56
80	8
81	1
82	6
83	15
84	20
85	15
86	6
87	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	4
12	5
13	2
14	1
15	2
16	1
17	1
18	6
19	11
20	8
21	2
22	1
23	4
24	6
25	4
26	1
27	1
28	6
29	12
30	10
31	3
32	1
33	4
34	5
35	2
36	1
37	10
38	31
39	42
40	26
41	6
42	1
43	4
44	6
45	4
46	1
47	1
48	12
49	45
50	79
51	72
52	33
53	6
54	1
55	6
56	14
57	16
58	9
59	2
60	1
61	8
62	21
63	25
64	14
65	3
66	1
67	8
68	24
69	36
70	29
71	12
72	2
73	1
74	16
75	79
76	183
77	228
78	157
79	56
80	8
81	1
82	6
83	15
84	20
85	15
86	6
87	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	4
12	5
13	2
14	1
15	2
16	1
17	1
18	6
19	11
20	8
21	2
22	1
23	4
24	6
25	4
26	1
27	1
28	6
29	12
30	10
31	3
32	1
33	4
34	5
35	2
36	1
37	10
38	31
39	42
40	26
41	6
42	1
43	4
44	6
45	4
46	1
47	1
48	12
49	45
50	79
51	72
52	33
53	6
54	1
55	6
56	14
57	16
58	9
59	2
60	1
61	8
62	21
63	25
64	14
65	3
66	1
67	8
68	24
69	36
70	29
71	12
72	2
73	1
74	16
75	79
76	183
77	228
78	157
79	56
80	8
81	1
82	6
83	15
84	20
85	15
86	6
87	1