A182590 - cp's OEIS frontend

A182590 Number of distinct prime factors of 2^n - 1 of the form k*n + 1.

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

[1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 2, 1, 1, 2, 3, 2, 1, 2, 2, 1, 2, 3, 3, 1, 2, 1, 2, 2, 3, 2, 2, 3, 2, 2, 4, 3, 3, 2, 3, 3, 3, 1, 4, 4, 3, 3, 2, 3, 2, 3, 5, 2, 2, 1, 2, 3, 4, 2, 3, 2, 3, 1, 4, 3, 3, 3, 4, 5, 3, 1, 5, 3, 2, 3, 4, 2, 3, 2, 4, 3]

cp's OEIS Frontend

A182590 Number of distinct prime factors of 2^n - 1 of the form k*n + 1.

Table of values

List of values

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

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

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