A366899 - cp's OEIS frontend

A366899 Number of prime factors of n*2^n - 1, counted with multiplicity.

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

[0, 1, 1, 3, 2, 1, 2, 2, 2, 2, 3, 2, 4, 5, 4, 6, 3, 2, 3, 2, 4, 5, 3, 3, 2, 3, 3, 4, 5, 1, 3, 2, 3, 5, 3, 5, 2, 3, 2, 5, 4, 3, 5, 3, 4, 5, 7, 4, 4, 3, 3, 4, 5, 3, 4, 3, 4, 3, 5, 3, 3, 4, 3, 9, 6, 4, 4, 6, 4, 3, 3, 2, 5, 4, 1, 9, 3, 4, 5, 2, 1, 4, 5, 6, 2, 3, 4]

cp's OEIS Frontend

A366899 Number of prime factors of n*2^n - 1, counted with multiplicity.

Table of values

List of values

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

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

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