A268631 - cp's OEIS frontend

A268631 Number of ordered pairs (a,b) of positive integers less than n with the property that n divides ab.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	4
7	0
8	5
9	4
10	8
11	0
12	17
13	0
14	12
15	16
16	17
17	0
18	28
19	0
20	33
21	24
22	20
23	0
24	53
25	16
26	24
27	28
28	49
29	0
30	76
31	0
32	49
33	40
34	32
35	48
36	97
37	0
38	36
39	48
40	101
41	0
42	112
43	0
44	81
45	100
46	44
47	0
48	145
49	36
50	96
51	64
52	97
53	0
54	136
55	80
56	149
57	72
58	56
59	0
60	241
61	0
62	60
63	148
64	129
65	96
66	184
67	0
68	129
69	88
70	212

[0, 0, 0, 1, 0, 4, 0, 5, 4, 8, 0, 17, 0, 12, 16, 17, 0, 28, 0, 33, 24, 20, 0, 53, 16, 24, 28, 49, 0, 76, 0, 49, 40, 32, 48, 97, 0, 36, 48, 101, 0, 112, 0, 81, 100, 44, 0, 145, 36, 96, 64, 97, 0, 136, 80, 149, 72, 56, 0, 241, 0, 60, 148, 129, 96, 184, 0, 129, 88, 212]

cp's OEIS Frontend

A268631 Number of ordered pairs (a,b) of positive integers less than n with the property that n divides ab.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	4
7	0
8	5
9	4
10	8
11	0
12	17
13	0
14	12
15	16
16	17
17	0
18	28
19	0
20	33
21	24
22	20
23	0
24	53
25	16
26	24
27	28
28	49
29	0
30	76
31	0
32	49
33	40
34	32
35	48
36	97
37	0
38	36
39	48
40	101
41	0
42	112
43	0
44	81
45	100
46	44
47	0
48	145
49	36
50	96
51	64
52	97
53	0
54	136
55	80
56	149
57	72
58	56
59	0
60	241
61	0
62	60
63	148
64	129
65	96
66	184
67	0
68	129
69	88
70	212

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	4
7	0
8	5
9	4
10	8
11	0
12	17
13	0
14	12
15	16
16	17
17	0
18	28
19	0
20	33
21	24
22	20
23	0
24	53
25	16
26	24
27	28
28	49
29	0
30	76
31	0
32	49
33	40
34	32
35	48
36	97
37	0
38	36
39	48
40	101
41	0
42	112
43	0
44	81
45	100
46	44
47	0
48	145
49	36
50	96
51	64
52	97
53	0
54	136
55	80
56	149
57	72
58	56
59	0
60	241
61	0
62	60
63	148
64	129
65	96
66	184
67	0
68	129
69	88
70	212

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	4
7	0
8	5
9	4
10	8
11	0
12	17
13	0
14	12
15	16
16	17
17	0
18	28
19	0
20	33
21	24
22	20
23	0
24	53
25	16
26	24
27	28
28	49
29	0
30	76
31	0
32	49
33	40
34	32
35	48
36	97
37	0
38	36
39	48
40	101
41	0
42	112
43	0
44	81
45	100
46	44
47	0
48	145
49	36
50	96
51	64
52	97
53	0
54	136
55	80
56	149
57	72
58	56
59	0
60	241
61	0
62	60
63	148
64	129
65	96
66	184
67	0
68	129
69	88
70	212