A129296 - cp's OEIS frontend

A129296 Number of divisors of n^2 - 1 that are not greater than n.

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	5
8	3
9	5
10	3
11	8
12	2
13	8
14	4
15	6
16	4
17	9
18	2
19	12
20	4
21	8
22	4
23	10
24	3
25	10
26	6
27	8
28	4
29	16
30	2
31	14
32	4
33	7
34	8
35	12
36	4
37	12
38	4
39	10
40	4
41	20
42	2
43	16
44	6
45	8
46	6
47	12
48	3
49	18
50	6
51	12
52	4
53	16
54	4
55	20
56	8
57	10
58	4
59	16
60	2
61	16
62	6
63	8
64	12
65	16
66	4
67	16
68	4
69	16
70	4
71	30
72	2
73	15
74	6
75	8
76	12
77	16
78	4
79	24
80	5
81	12
82	5
83	16
84	4
85	16
86	8
87	10
88	4
89	30
90	4

[1, 1, 2, 2, 4, 2, 5, 3, 5, 3, 8, 2, 8, 4, 6, 4, 9, 2, 12, 4, 8, 4, 10, 3, 10, 6, 8, 4, 16, 2, 14, 4, 7, 8, 12, 4, 12, 4, 10, 4, 20, 2, 16, 6, 8, 6, 12, 3, 18, 6, 12, 4, 16, 4, 20, 8, 10, 4, 16, 2, 16, 6, 8, 12, 16, 4, 16, 4, 16, 4, 30, 2, 15, 6, 8, 12, 16, 4, 24, 5, 12, 5, 16, 4, 16, 8, 10, 4, 30, 4]

cp's OEIS Frontend

A129296 Number of divisors of n^2 - 1 that are not greater than n.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	5
8	3
9	5
10	3
11	8
12	2
13	8
14	4
15	6
16	4
17	9
18	2
19	12
20	4
21	8
22	4
23	10
24	3
25	10
26	6
27	8
28	4
29	16
30	2
31	14
32	4
33	7
34	8
35	12
36	4
37	12
38	4
39	10
40	4
41	20
42	2
43	16
44	6
45	8
46	6
47	12
48	3
49	18
50	6
51	12
52	4
53	16
54	4
55	20
56	8
57	10
58	4
59	16
60	2
61	16
62	6
63	8
64	12
65	16
66	4
67	16
68	4
69	16
70	4
71	30
72	2
73	15
74	6
75	8
76	12
77	16
78	4
79	24
80	5
81	12
82	5
83	16
84	4
85	16
86	8
87	10
88	4
89	30
90	4

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	5
8	3
9	5
10	3
11	8
12	2
13	8
14	4
15	6
16	4
17	9
18	2
19	12
20	4
21	8
22	4
23	10
24	3
25	10
26	6
27	8
28	4
29	16
30	2
31	14
32	4
33	7
34	8
35	12
36	4
37	12
38	4
39	10
40	4
41	20
42	2
43	16
44	6
45	8
46	6
47	12
48	3
49	18
50	6
51	12
52	4
53	16
54	4
55	20
56	8
57	10
58	4
59	16
60	2
61	16
62	6
63	8
64	12
65	16
66	4
67	16
68	4
69	16
70	4
71	30
72	2
73	15
74	6
75	8
76	12
77	16
78	4
79	24
80	5
81	12
82	5
83	16
84	4
85	16
86	8
87	10
88	4
89	30
90	4

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	5
8	3
9	5
10	3
11	8
12	2
13	8
14	4
15	6
16	4
17	9
18	2
19	12
20	4
21	8
22	4
23	10
24	3
25	10
26	6
27	8
28	4
29	16
30	2
31	14
32	4
33	7
34	8
35	12
36	4
37	12
38	4
39	10
40	4
41	20
42	2
43	16
44	6
45	8
46	6
47	12
48	3
49	18
50	6
51	12
52	4
53	16
54	4
55	20
56	8
57	10
58	4
59	16
60	2
61	16
62	6
63	8
64	12
65	16
66	4
67	16
68	4
69	16
70	4
71	30
72	2
73	15
74	6
75	8
76	12
77	16
78	4
79	24
80	5
81	12
82	5
83	16
84	4
85	16
86	8
87	10
88	4
89	30
90	4