A072627 - cp's OEIS frontend

A072627 Number of divisors d of n such that d-1 is prime.

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	2
7	0
8	2
9	1
10	0
11	0
12	4
13	0
14	1
15	1
16	2
17	0
18	3
19	0
20	2
21	1
22	0
23	0
24	6
25	0
26	0
27	1
28	2
29	0
30	3
31	0
32	3
33	1
34	0
35	0
36	5
37	0
38	1
39	1
40	3
41	0
42	4
43	0
44	2
45	1
46	0
47	0
48	7
49	0
50	0
51	1
52	1
53	0
54	4
55	0
56	3
57	1
58	0
59	0
60	7
61	0
62	1
63	1
64	3
65	0
66	2
67	0
68	2
69	1
70	1
71	0
72	8
73	0
74	1
75	1
76	2
77	0
78	2
79	0
80	4
81	1
82	0
83	0
84	7
85	0
86	0
87	1
88	3
89	0
90	5
91	0
92	1
93	1
94	0
95	0
96	8
97	0
98	2
99	1
100	2
101	0
102	3
103	0
104	3
105	1

[0, 0, 1, 1, 0, 2, 0, 2, 1, 0, 0, 4, 0, 1, 1, 2, 0, 3, 0, 2, 1, 0, 0, 6, 0, 0, 1, 2, 0, 3, 0, 3, 1, 0, 0, 5, 0, 1, 1, 3, 0, 4, 0, 2, 1, 0, 0, 7, 0, 0, 1, 1, 0, 4, 0, 3, 1, 0, 0, 7, 0, 1, 1, 3, 0, 2, 0, 2, 1, 1, 0, 8, 0, 1, 1, 2, 0, 2, 0, 4, 1, 0, 0, 7, 0, 0, 1, 3, 0, 5, 0, 1, 1, 0, 0, 8, 0, 2, 1, 2, 0, 3, 0, 3, 1]

cp's OEIS Frontend

A072627 Number of divisors d of n such that d-1 is prime.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	2
7	0
8	2
9	1
10	0
11	0
12	4
13	0
14	1
15	1
16	2
17	0
18	3
19	0
20	2
21	1
22	0
23	0
24	6
25	0
26	0
27	1
28	2
29	0
30	3
31	0
32	3
33	1
34	0
35	0
36	5
37	0
38	1
39	1
40	3
41	0
42	4
43	0
44	2
45	1
46	0
47	0
48	7
49	0
50	0
51	1
52	1
53	0
54	4
55	0
56	3
57	1
58	0
59	0
60	7
61	0
62	1
63	1
64	3
65	0
66	2
67	0
68	2
69	1
70	1
71	0
72	8
73	0
74	1
75	1
76	2
77	0
78	2
79	0
80	4
81	1
82	0
83	0
84	7
85	0
86	0
87	1
88	3
89	0
90	5
91	0
92	1
93	1
94	0
95	0
96	8
97	0
98	2
99	1
100	2
101	0
102	3
103	0
104	3
105	1

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	2
7	0
8	2
9	1
10	0
11	0
12	4
13	0
14	1
15	1
16	2
17	0
18	3
19	0
20	2
21	1
22	0
23	0
24	6
25	0
26	0
27	1
28	2
29	0
30	3
31	0
32	3
33	1
34	0
35	0
36	5
37	0
38	1
39	1
40	3
41	0
42	4
43	0
44	2
45	1
46	0
47	0
48	7
49	0
50	0
51	1
52	1
53	0
54	4
55	0
56	3
57	1
58	0
59	0
60	7
61	0
62	1
63	1
64	3
65	0
66	2
67	0
68	2
69	1
70	1
71	0
72	8
73	0
74	1
75	1
76	2
77	0
78	2
79	0
80	4
81	1
82	0
83	0
84	7
85	0
86	0
87	1
88	3
89	0
90	5
91	0
92	1
93	1
94	0
95	0
96	8
97	0
98	2
99	1
100	2
101	0
102	3
103	0
104	3
105	1

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	2
7	0
8	2
9	1
10	0
11	0
12	4
13	0
14	1
15	1
16	2
17	0
18	3
19	0
20	2
21	1
22	0
23	0
24	6
25	0
26	0
27	1
28	2
29	0
30	3
31	0
32	3
33	1
34	0
35	0
36	5
37	0
38	1
39	1
40	3
41	0
42	4
43	0
44	2
45	1
46	0
47	0
48	7
49	0
50	0
51	1
52	1
53	0
54	4
55	0
56	3
57	1
58	0
59	0
60	7
61	0
62	1
63	1
64	3
65	0
66	2
67	0
68	2
69	1
70	1
71	0
72	8
73	0
74	1
75	1
76	2
77	0
78	2
79	0
80	4
81	1
82	0
83	0
84	7
85	0
86	0
87	1
88	3
89	0
90	5
91	0
92	1
93	1
94	0
95	0
96	8
97	0
98	2
99	1
100	2
101	0
102	3
103	0
104	3
105	1