A137921 - cp's OEIS frontend

A137921 Number of divisors d of n such that d+1 is not a divisor of n.

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	3
11	2
12	3
13	2
14	3
15	4
16	4
17	2
18	4
19	2
20	4
21	4
22	3
23	2
24	5
25	3
26	3
27	4
28	5
29	2
30	5
31	2
32	5
33	4
34	3
35	4
36	6
37	2
38	3
39	4
40	6
41	2
42	5
43	2
44	5
45	6
46	3
47	2
48	7
49	3
50	5
51	4
52	5
53	2
54	6
55	4
56	6
57	4
58	3
59	2
60	7
61	2
62	3
63	6
64	6
65	4
66	6
67	2
68	5
69	4
70	7
71	2
72	8
73	2
74	3
75	6
76	5
77	4
78	6
79	2
80	8
81	5
82	3
83	2
84	8
85	4
86	3
87	4
88	7
89	2
90	8
91	4
92	5
93	4
94	3
95	4
96	9
97	2
98	5
99	6
100	7
101	2
102	6
103	2
104	7
105	8

[1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 2, 3, 2, 3, 4, 4, 2, 4, 2, 4, 4, 3, 2, 5, 3, 3, 4, 5, 2, 5, 2, 5, 4, 3, 4, 6, 2, 3, 4, 6, 2, 5, 2, 5, 6, 3, 2, 7, 3, 5, 4, 5, 2, 6, 4, 6, 4, 3, 2, 7, 2, 3, 6, 6, 4, 6, 2, 5, 4, 7, 2, 8, 2, 3, 6, 5, 4, 6, 2, 8, 5, 3, 2, 8, 4, 3, 4, 7, 2, 8, 4, 5, 4, 3, 4, 9, 2, 5, 6, 7, 2, 6, 2, 7, 8]

cp's OEIS Frontend

A137921 Number of divisors d of n such that d+1 is not a divisor of n.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	3
11	2
12	3
13	2
14	3
15	4
16	4
17	2
18	4
19	2
20	4
21	4
22	3
23	2
24	5
25	3
26	3
27	4
28	5
29	2
30	5
31	2
32	5
33	4
34	3
35	4
36	6
37	2
38	3
39	4
40	6
41	2
42	5
43	2
44	5
45	6
46	3
47	2
48	7
49	3
50	5
51	4
52	5
53	2
54	6
55	4
56	6
57	4
58	3
59	2
60	7
61	2
62	3
63	6
64	6
65	4
66	6
67	2
68	5
69	4
70	7
71	2
72	8
73	2
74	3
75	6
76	5
77	4
78	6
79	2
80	8
81	5
82	3
83	2
84	8
85	4
86	3
87	4
88	7
89	2
90	8
91	4
92	5
93	4
94	3
95	4
96	9
97	2
98	5
99	6
100	7
101	2
102	6
103	2
104	7
105	8

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	3
11	2
12	3
13	2
14	3
15	4
16	4
17	2
18	4
19	2
20	4
21	4
22	3
23	2
24	5
25	3
26	3
27	4
28	5
29	2
30	5
31	2
32	5
33	4
34	3
35	4
36	6
37	2
38	3
39	4
40	6
41	2
42	5
43	2
44	5
45	6
46	3
47	2
48	7
49	3
50	5
51	4
52	5
53	2
54	6
55	4
56	6
57	4
58	3
59	2
60	7
61	2
62	3
63	6
64	6
65	4
66	6
67	2
68	5
69	4
70	7
71	2
72	8
73	2
74	3
75	6
76	5
77	4
78	6
79	2
80	8
81	5
82	3
83	2
84	8
85	4
86	3
87	4
88	7
89	2
90	8
91	4
92	5
93	4
94	3
95	4
96	9
97	2
98	5
99	6
100	7
101	2
102	6
103	2
104	7
105	8

n	a(n)
1	1
2	1
3	2
4	2
5	2
6	2
7	2
8	3
9	3
10	3
11	2
12	3
13	2
14	3
15	4
16	4
17	2
18	4
19	2
20	4
21	4
22	3
23	2
24	5
25	3
26	3
27	4
28	5
29	2
30	5
31	2
32	5
33	4
34	3
35	4
36	6
37	2
38	3
39	4
40	6
41	2
42	5
43	2
44	5
45	6
46	3
47	2
48	7
49	3
50	5
51	4
52	5
53	2
54	6
55	4
56	6
57	4
58	3
59	2
60	7
61	2
62	3
63	6
64	6
65	4
66	6
67	2
68	5
69	4
70	7
71	2
72	8
73	2
74	3
75	6
76	5
77	4
78	6
79	2
80	8
81	5
82	3
83	2
84	8
85	4
86	3
87	4
88	7
89	2
90	8
91	4
92	5
93	4
94	3
95	4
96	9
97	2
98	5
99	6
100	7
101	2
102	6
103	2
104	7
105	8