A320436 - cp's OEIS frontend

A320436 Irregular triangle read by rows where T(n,k) is the number of pairwise coprime k-subsets of {1,...,n}, 1 <= k <= A036234(n), where a single number is not considered to be pairwise coprime unless it is equal to 1.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	1
11	9
12	7
13	2
14	1
15	11
16	8
17	2
18	1
19	17
20	19
21	10
22	2
23	1
24	21
25	25
26	14
27	3
28	1
29	27
30	37
31	24
32	6
33	1
34	31
35	42
36	26
37	6
38	1
39	41
40	73
41	68
42	32
43	6
44	1
45	45
46	79
47	72
48	33
49	6
50	1
51	57
52	124
53	151
54	105
55	39
56	6
57	1
58	63
59	138
60	167
61	114
62	41
63	6
64	1
65	71
66	159
67	192
68	128
69	44
70	6
71	1
72	79

[1, 1, 1, 1, 3, 1, 1, 5, 2, 1, 9, 7, 2, 1, 11, 8, 2, 1, 17, 19, 10, 2, 1, 21, 25, 14, 3, 1, 27, 37, 24, 6, 1, 31, 42, 26, 6, 1, 41, 73, 68, 32, 6, 1, 45, 79, 72, 33, 6, 1, 57, 124, 151, 105, 39, 6, 1, 63, 138, 167, 114, 41, 6, 1, 71, 159, 192, 128, 44, 6, 1, 79]

cp's OEIS Frontend

A320436 Irregular triangle read by rows where T(n,k) is the number of pairwise coprime k-subsets of {1,...,n}, 1 <= k <= A036234(n), where a single number is not considered to be pairwise coprime unless it is equal to 1.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	1
11	9
12	7
13	2
14	1
15	11
16	8
17	2
18	1
19	17
20	19
21	10
22	2
23	1
24	21
25	25
26	14
27	3
28	1
29	27
30	37
31	24
32	6
33	1
34	31
35	42
36	26
37	6
38	1
39	41
40	73
41	68
42	32
43	6
44	1
45	45
46	79
47	72
48	33
49	6
50	1
51	57
52	124
53	151
54	105
55	39
56	6
57	1
58	63
59	138
60	167
61	114
62	41
63	6
64	1
65	71
66	159
67	192
68	128
69	44
70	6
71	1
72	79

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	1
11	9
12	7
13	2
14	1
15	11
16	8
17	2
18	1
19	17
20	19
21	10
22	2
23	1
24	21
25	25
26	14
27	3
28	1
29	27
30	37
31	24
32	6
33	1
34	31
35	42
36	26
37	6
38	1
39	41
40	73
41	68
42	32
43	6
44	1
45	45
46	79
47	72
48	33
49	6
50	1
51	57
52	124
53	151
54	105
55	39
56	6
57	1
58	63
59	138
60	167
61	114
62	41
63	6
64	1
65	71
66	159
67	192
68	128
69	44
70	6
71	1
72	79

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	1
11	9
12	7
13	2
14	1
15	11
16	8
17	2
18	1
19	17
20	19
21	10
22	2
23	1
24	21
25	25
26	14
27	3
28	1
29	27
30	37
31	24
32	6
33	1
34	31
35	42
36	26
37	6
38	1
39	41
40	73
41	68
42	32
43	6
44	1
45	45
46	79
47	72
48	33
49	6
50	1
51	57
52	124
53	151
54	105
55	39
56	6
57	1
58	63
59	138
60	167
61	114
62	41
63	6
64	1
65	71
66	159
67	192
68	128
69	44
70	6
71	1
72	79