A359938 - cp's OEIS frontend

A359938 Number of divisors d of n such that d-1 is square.

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

[1, 2, 1, 2, 2, 2, 1, 2, 1, 4, 1, 2, 1, 2, 2, 2, 2, 2, 1, 4, 1, 2, 1, 2, 2, 3, 1, 2, 1, 4, 1, 2, 1, 3, 2, 2, 2, 2, 1, 4, 1, 2, 1, 2, 2, 2, 1, 2, 1, 5, 2, 3, 1, 2, 2, 2, 1, 2, 1, 4, 1, 2, 1, 2, 3, 2, 1, 3, 1, 4, 1, 2, 1, 3, 2, 2, 1, 3, 1, 4, 1, 3, 1, 2, 3, 2, 1, 2, 1, 4]

cp's OEIS Frontend

A359938 Number of divisors d of n such that d-1 is square.

Table of values

List of values

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

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

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