A046800 - cp's OEIS frontend

A046800 Number of distinct prime factors of 2^n-1.

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

[0, 0, 1, 1, 2, 1, 2, 1, 3, 2, 3, 2, 4, 1, 3, 3, 4, 1, 4, 1, 5, 3, 4, 2, 6, 3, 3, 3, 6, 3, 6, 1, 5, 4, 3, 4, 8, 2, 3, 4, 7, 2, 6, 3, 7, 6, 4, 3, 9, 2, 7, 5, 7, 3, 6, 6, 8, 4, 6, 2, 11, 1, 3, 6, 7, 3, 8, 2, 7, 4, 9, 3, 12, 3, 5, 7, 7, 4, 7, 3, 9, 6, 5, 2, 12, 3, 5, 6, 10, 1, 11, 5, 9, 3, 6, 5, 12, 2, 5, 8, 12, 2]

cp's OEIS Frontend

A046800 Number of distinct prime factors of 2^n-1.

Table of values

List of values

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

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

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