A186975 - cp's OEIS frontend

A186975 Irregular triangle T(n,k), n>=1, 1<=k<=A186971(n), read by rows: T(n,k) is the number of subsets of {1, 2, ..., n} containing n and having <=k pairwise coprime elements.

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	1
8	3
9	4
10	1
11	5
12	10
13	12
14	1
15	3
16	4
17	1
18	7
19	18
20	26
21	28
22	1
23	5
24	11
25	15
26	16
27	1
28	7
29	19
30	29
31	32
32	1
33	5
34	10
35	12
36	1
37	11
38	42
39	84
40	110
41	116
42	1
43	5
44	11
45	15
46	16
47	1
48	13
49	58
50	137
51	209
52	242
53	248
54	1
55	7
56	21
57	37
58	46
59	48
60	1
61	9
62	30
63	55
64	69
65	72
66	1
67	9
68	33
69	69
70	98
71	110
72	112

[1, 1, 2, 1, 3, 4, 1, 3, 4, 1, 5, 10, 12, 1, 3, 4, 1, 7, 18, 26, 28, 1, 5, 11, 15, 16, 1, 7, 19, 29, 32, 1, 5, 10, 12, 1, 11, 42, 84, 110, 116, 1, 5, 11, 15, 16, 1, 13, 58, 137, 209, 242, 248, 1, 7, 21, 37, 46, 48, 1, 9, 30, 55, 69, 72, 1, 9, 33, 69, 98, 110, 112]

cp's OEIS Frontend

A186975 Irregular triangle T(n,k), n>=1, 1<=k<=A186971(n), read by rows: T(n,k) is the number of subsets of {1, 2, ..., n} containing n and having <=k pairwise coprime elements.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	1
8	3
9	4
10	1
11	5
12	10
13	12
14	1
15	3
16	4
17	1
18	7
19	18
20	26
21	28
22	1
23	5
24	11
25	15
26	16
27	1
28	7
29	19
30	29
31	32
32	1
33	5
34	10
35	12
36	1
37	11
38	42
39	84
40	110
41	116
42	1
43	5
44	11
45	15
46	16
47	1
48	13
49	58
50	137
51	209
52	242
53	248
54	1
55	7
56	21
57	37
58	46
59	48
60	1
61	9
62	30
63	55
64	69
65	72
66	1
67	9
68	33
69	69
70	98
71	110
72	112

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	1
8	3
9	4
10	1
11	5
12	10
13	12
14	1
15	3
16	4
17	1
18	7
19	18
20	26
21	28
22	1
23	5
24	11
25	15
26	16
27	1
28	7
29	19
30	29
31	32
32	1
33	5
34	10
35	12
36	1
37	11
38	42
39	84
40	110
41	116
42	1
43	5
44	11
45	15
46	16
47	1
48	13
49	58
50	137
51	209
52	242
53	248
54	1
55	7
56	21
57	37
58	46
59	48
60	1
61	9
62	30
63	55
64	69
65	72
66	1
67	9
68	33
69	69
70	98
71	110
72	112

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	1
8	3
9	4
10	1
11	5
12	10
13	12
14	1
15	3
16	4
17	1
18	7
19	18
20	26
21	28
22	1
23	5
24	11
25	15
26	16
27	1
28	7
29	19
30	29
31	32
32	1
33	5
34	10
35	12
36	1
37	11
38	42
39	84
40	110
41	116
42	1
43	5
44	11
45	15
46	16
47	1
48	13
49	58
50	137
51	209
52	242
53	248
54	1
55	7
56	21
57	37
58	46
59	48
60	1
61	9
62	30
63	55
64	69
65	72
66	1
67	9
68	33
69	69
70	98
71	110
72	112