A275387 - cp's OEIS frontend

A275387 Numbers of ordered pairs of divisors d < e of n such that gcd(d, e) > 1.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	8
13	0
14	2
15	2
16	6
17	0
18	8
19	0
20	8
21	2
22	2
23	0
24	18
25	1
26	2
27	3
28	8
29	0
30	15
31	0
32	10
33	2
34	2
35	2
36	24
37	0
38	2
39	2
40	18
41	0
42	15
43	0
44	8
45	8
46	2
47	0
48	32
49	1
50	8
51	2
52	8
53	0
54	18
55	2
56	18
57	2
58	2
59	0
60	44
61	0
62	2
63	8
64	15
65	2
66	15
67	0
68	8
69	2
70	15
71	0
72	49
73	0
74	2
75	8
76	8
77	2
78	15
79	0
80	32
81	6
82	2

[0, 0, 0, 1, 0, 2, 0, 3, 1, 2, 0, 8, 0, 2, 2, 6, 0, 8, 0, 8, 2, 2, 0, 18, 1, 2, 3, 8, 0, 15, 0, 10, 2, 2, 2, 24, 0, 2, 2, 18, 0, 15, 0, 8, 8, 2, 0, 32, 1, 8, 2, 8, 0, 18, 2, 18, 2, 2, 0, 44, 0, 2, 8, 15, 2, 15, 0, 8, 2, 15, 0, 49, 0, 2, 8, 8, 2, 15, 0, 32, 6, 2]

cp's OEIS Frontend

A275387 Numbers of ordered pairs of divisors d < e of n such that gcd(d, e) > 1.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	8
13	0
14	2
15	2
16	6
17	0
18	8
19	0
20	8
21	2
22	2
23	0
24	18
25	1
26	2
27	3
28	8
29	0
30	15
31	0
32	10
33	2
34	2
35	2
36	24
37	0
38	2
39	2
40	18
41	0
42	15
43	0
44	8
45	8
46	2
47	0
48	32
49	1
50	8
51	2
52	8
53	0
54	18
55	2
56	18
57	2
58	2
59	0
60	44
61	0
62	2
63	8
64	15
65	2
66	15
67	0
68	8
69	2
70	15
71	0
72	49
73	0
74	2
75	8
76	8
77	2
78	15
79	0
80	32
81	6
82	2

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	8
13	0
14	2
15	2
16	6
17	0
18	8
19	0
20	8
21	2
22	2
23	0
24	18
25	1
26	2
27	3
28	8
29	0
30	15
31	0
32	10
33	2
34	2
35	2
36	24
37	0
38	2
39	2
40	18
41	0
42	15
43	0
44	8
45	8
46	2
47	0
48	32
49	1
50	8
51	2
52	8
53	0
54	18
55	2
56	18
57	2
58	2
59	0
60	44
61	0
62	2
63	8
64	15
65	2
66	15
67	0
68	8
69	2
70	15
71	0
72	49
73	0
74	2
75	8
76	8
77	2
78	15
79	0
80	32
81	6
82	2

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	8
13	0
14	2
15	2
16	6
17	0
18	8
19	0
20	8
21	2
22	2
23	0
24	18
25	1
26	2
27	3
28	8
29	0
30	15
31	0
32	10
33	2
34	2
35	2
36	24
37	0
38	2
39	2
40	18
41	0
42	15
43	0
44	8
45	8
46	2
47	0
48	32
49	1
50	8
51	2
52	8
53	0
54	18
55	2
56	18
57	2
58	2
59	0
60	44
61	0
62	2
63	8
64	15
65	2
66	15
67	0
68	8
69	2
70	15
71	0
72	49
73	0
74	2
75	8
76	8
77	2
78	15
79	0
80	32
81	6
82	2