A141197 - cp's OEIS frontend

A141197 a(n) = the number of divisors of n that are each one less than a power of a prime.

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

[1, 2, 2, 3, 1, 4, 2, 4, 2, 3, 1, 6, 1, 3, 3, 5, 1, 5, 1, 4, 3, 3, 1, 8, 1, 3, 2, 5, 1, 7, 2, 5, 2, 2, 2, 8, 1, 2, 2, 6, 1, 6, 1, 4, 3, 3, 1, 10, 2, 3, 2, 5, 1, 5, 1, 6, 2, 3, 1, 10, 1, 3, 4, 5, 1, 6, 1, 3, 2, 5, 1, 11, 1, 2, 3, 3, 2, 6, 1, 8, 2, 3, 1, 9, 1, 2, 2, 6, 1, 8, 2, 4, 3, 2, 1, 11, 1, 3, 2, 5, 1, 5, 1]

cp's OEIS Frontend

A141197 a(n) = the number of divisors of n that are each one less than a power of a prime.

Table of values

List of values

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

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

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