A186987 - cp's OEIS frontend

A186987 Number of subsets of {1, 2, ..., n} containing n and having <=3 pairwise coprime elements.

n	a(n)
1	1
2	2
3	4
4	4
5	10
6	4
7	18
8	11
9	19
10	10
11	42
12	11
13	58
14	21
15	30
16	33
17	96
18	22
19	120
20	36
21	62
22	48
23	172
24	37
25	147
26	69
27	128
28	70
29	270
30	37
31	308
32	123
33	158
34	117
35	208
36	75
37	432
38	147
39	218
40	119
41	530
42	78
43	584
44	186
45	228
46	212
47	696
48	133
49	594
50	191
51	380
52	256
53	882
54	166
55	547

[1, 2, 4, 4, 10, 4, 18, 11, 19, 10, 42, 11, 58, 21, 30, 33, 96, 22, 120, 36, 62, 48, 172, 37, 147, 69, 128, 70, 270, 37, 308, 123, 158, 117, 208, 75, 432, 147, 218, 119, 530, 78, 584, 186, 228, 212, 696, 133, 594, 191, 380, 256, 882, 166, 547]

cp's OEIS Frontend

A186987 Number of subsets of {1, 2, ..., n} containing n and having <=3 pairwise coprime elements.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	4
5	10
6	4
7	18
8	11
9	19
10	10
11	42
12	11
13	58
14	21
15	30
16	33
17	96
18	22
19	120
20	36
21	62
22	48
23	172
24	37
25	147
26	69
27	128
28	70
29	270
30	37
31	308
32	123
33	158
34	117
35	208
36	75
37	432
38	147
39	218
40	119
41	530
42	78
43	584
44	186
45	228
46	212
47	696
48	133
49	594
50	191
51	380
52	256
53	882
54	166
55	547

n	a(n)
1	1
2	2
3	4
4	4
5	10
6	4
7	18
8	11
9	19
10	10
11	42
12	11
13	58
14	21
15	30
16	33
17	96
18	22
19	120
20	36
21	62
22	48
23	172
24	37
25	147
26	69
27	128
28	70
29	270
30	37
31	308
32	123
33	158
34	117
35	208
36	75
37	432
38	147
39	218
40	119
41	530
42	78
43	584
44	186
45	228
46	212
47	696
48	133
49	594
50	191
51	380
52	256
53	882
54	166
55	547

n	a(n)
1	1
2	2
3	4
4	4
5	10
6	4
7	18
8	11
9	19
10	10
11	42
12	11
13	58
14	21
15	30
16	33
17	96
18	22
19	120
20	36
21	62
22	48
23	172
24	37
25	147
26	69
27	128
28	70
29	270
30	37
31	308
32	123
33	158
34	117
35	208
36	75
37	432
38	147
39	218
40	119
41	530
42	78
43	584
44	186
45	228
46	212
47	696
48	133
49	594
50	191
51	380
52	256
53	882
54	166
55	547