A046051 - cp's OEIS frontend

A046051 Number of prime factors of Mersenne number M(n) = 2^n - 1 (counted with multiplicity).

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

[0, 1, 1, 2, 1, 3, 1, 3, 2, 3, 2, 5, 1, 3, 3, 4, 1, 6, 1, 6, 4, 4, 2, 7, 3, 3, 3, 6, 3, 7, 1, 5, 4, 3, 4, 10, 2, 3, 4, 8, 2, 8, 3, 7, 6, 4, 3, 10, 2, 7, 5, 7, 3, 9, 6, 8, 4, 6, 2, 13, 1, 3, 7, 7, 3, 9, 2, 7, 4, 9, 3, 14, 3, 5, 7, 7, 4, 8, 3, 10, 6, 5, 2, 14, 3, 5, 6, 10, 1, 13, 5, 9, 3, 6, 5, 13, 2, 5, 8]

cp's OEIS Frontend

A046051 Number of prime factors of Mersenne number M(n) = 2^n - 1 (counted with multiplicity).

Table of values

List of values

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

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

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