A046886 - cp's OEIS frontend

A046886 Number of divisors d of 2n satisfying (d+1) = prime or number of prime factors of the denominator of the even Bernoulli numbers.

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

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

cp's OEIS Frontend

A046886 Number of divisors d of 2n satisfying (d+1) = prime or number of prime factors of the denominator of the even Bernoulli numbers.

Table of values

List of values

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

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

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