A381094 - cp's OEIS frontend

A381094 Triangle read by rows where row n contains k < n that are neither coprime to n nor have the same squarefree kernel as n, or 0 if there are no such k.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	3
8	4
9	0
10	6
11	6
12	2
13	4
14	5
15	6
16	8
17	0
18	2
19	3
20	4
21	8
22	9
23	10
24	0
25	2
26	4
27	6
28	7
29	8
30	10
31	12
32	3
33	5
34	6
35	9
36	10
37	12
38	6
39	10
40	12
41	14
42	0
43	2
44	3
45	4
46	8
47	9
48	10
49	14
50	15
51	16
52	0
53	2
54	4
55	5
56	6
57	8
58	12
59	14
60	15
61	16
62	18
63	3
64	6
65	7
66	9
67	12
68	14
69	15
70	18
71	2
72	4
73	6
74	8
75	10
76	11
77	12
78	14
79	16
80	18
81	20

[0, 0, 0, 0, 0, 2, 3, 4, 0, 6, 6, 2, 4, 5, 6, 8, 0, 2, 3, 4, 8, 9, 10, 0, 2, 4, 6, 7, 8, 10, 12, 3, 5, 6, 9, 10, 12, 6, 10, 12, 14, 0, 2, 3, 4, 8, 9, 10, 14, 15, 16, 0, 2, 4, 5, 6, 8, 12, 14, 15, 16, 18, 3, 6, 7, 9, 12, 14, 15, 18, 2, 4, 6, 8, 10, 11, 12, 14, 16, 18, 20]

cp's OEIS Frontend

A381094 Triangle read by rows where row n contains k < n that are neither coprime to n nor have the same squarefree kernel as n, or 0 if there are no such k.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	3
8	4
9	0
10	6
11	6
12	2
13	4
14	5
15	6
16	8
17	0
18	2
19	3
20	4
21	8
22	9
23	10
24	0
25	2
26	4
27	6
28	7
29	8
30	10
31	12
32	3
33	5
34	6
35	9
36	10
37	12
38	6
39	10
40	12
41	14
42	0
43	2
44	3
45	4
46	8
47	9
48	10
49	14
50	15
51	16
52	0
53	2
54	4
55	5
56	6
57	8
58	12
59	14
60	15
61	16
62	18
63	3
64	6
65	7
66	9
67	12
68	14
69	15
70	18
71	2
72	4
73	6
74	8
75	10
76	11
77	12
78	14
79	16
80	18
81	20

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	3
8	4
9	0
10	6
11	6
12	2
13	4
14	5
15	6
16	8
17	0
18	2
19	3
20	4
21	8
22	9
23	10
24	0
25	2
26	4
27	6
28	7
29	8
30	10
31	12
32	3
33	5
34	6
35	9
36	10
37	12
38	6
39	10
40	12
41	14
42	0
43	2
44	3
45	4
46	8
47	9
48	10
49	14
50	15
51	16
52	0
53	2
54	4
55	5
56	6
57	8
58	12
59	14
60	15
61	16
62	18
63	3
64	6
65	7
66	9
67	12
68	14
69	15
70	18
71	2
72	4
73	6
74	8
75	10
76	11
77	12
78	14
79	16
80	18
81	20

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	3
8	4
9	0
10	6
11	6
12	2
13	4
14	5
15	6
16	8
17	0
18	2
19	3
20	4
21	8
22	9
23	10
24	0
25	2
26	4
27	6
28	7
29	8
30	10
31	12
32	3
33	5
34	6
35	9
36	10
37	12
38	6
39	10
40	12
41	14
42	0
43	2
44	3
45	4
46	8
47	9
48	10
49	14
50	15
51	16
52	0
53	2
54	4
55	5
56	6
57	8
58	12
59	14
60	15
61	16
62	18
63	3
64	6
65	7
66	9
67	12
68	14
69	15
70	18
71	2
72	4
73	6
74	8
75	10
76	11
77	12
78	14
79	16
80	18
81	20