A187262 - cp's OEIS frontend

A187262 Irregular triangle T(n,k), n>=1, 1<=k<=A036234(n), read by rows: T(n,k) is the number of nonempty subsets of {1, 2, ..., n} having <=k pairwise coprime elements.

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	7
7	4
8	9
9	11
10	5
11	14
12	21
13	23
14	6
15	17
16	25
17	27
18	7
19	24
20	43
21	53
22	55
23	8
24	29
25	54
26	68
27	71
28	9
29	36
30	73
31	97
32	103
33	10
34	41
35	83
36	109
37	115
38	11
39	52
40	125
41	193
42	225
43	231
44	12
45	57
46	136
47	208
48	241
49	247
50	13
51	70
52	194
53	345
54	450
55	489
56	495
57	14
58	77
59	215
60	382
61	496
62	537
63	543

[1, 2, 3, 3, 6, 7, 4, 9, 11, 5, 14, 21, 23, 6, 17, 25, 27, 7, 24, 43, 53, 55, 8, 29, 54, 68, 71, 9, 36, 73, 97, 103, 10, 41, 83, 109, 115, 11, 52, 125, 193, 225, 231, 12, 57, 136, 208, 241, 247, 13, 70, 194, 345, 450, 489, 495, 14, 77, 215, 382, 496, 537, 543]

cp's OEIS Frontend

A187262 Irregular triangle T(n,k), n>=1, 1<=k<=A036234(n), read by rows: T(n,k) is the number of nonempty subsets of {1, 2, ..., n} having <=k pairwise coprime elements.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	7
7	4
8	9
9	11
10	5
11	14
12	21
13	23
14	6
15	17
16	25
17	27
18	7
19	24
20	43
21	53
22	55
23	8
24	29
25	54
26	68
27	71
28	9
29	36
30	73
31	97
32	103
33	10
34	41
35	83
36	109
37	115
38	11
39	52
40	125
41	193
42	225
43	231
44	12
45	57
46	136
47	208
48	241
49	247
50	13
51	70
52	194
53	345
54	450
55	489
56	495
57	14
58	77
59	215
60	382
61	496
62	537
63	543

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	7
7	4
8	9
9	11
10	5
11	14
12	21
13	23
14	6
15	17
16	25
17	27
18	7
19	24
20	43
21	53
22	55
23	8
24	29
25	54
26	68
27	71
28	9
29	36
30	73
31	97
32	103
33	10
34	41
35	83
36	109
37	115
38	11
39	52
40	125
41	193
42	225
43	231
44	12
45	57
46	136
47	208
48	241
49	247
50	13
51	70
52	194
53	345
54	450
55	489
56	495
57	14
58	77
59	215
60	382
61	496
62	537
63	543

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	7
7	4
8	9
9	11
10	5
11	14
12	21
13	23
14	6
15	17
16	25
17	27
18	7
19	24
20	43
21	53
22	55
23	8
24	29
25	54
26	68
27	71
28	9
29	36
30	73
31	97
32	103
33	10
34	41
35	83
36	109
37	115
38	11
39	52
40	125
41	193
42	225
43	231
44	12
45	57
46	136
47	208
48	241
49	247
50	13
51	70
52	194
53	345
54	450
55	489
56	495
57	14
58	77
59	215
60	382
61	496
62	537
63	543