A182595 - cp's OEIS frontend

A182595 Number of prime factors of form cn+1 for numbers 2^n+1.

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

[1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 3, 1, 1, 2, 2, 1, 2, 2, 3, 2, 2, 2, 3, 2, 1, 2, 2, 1, 2, 1, 4, 2, 2, 1, 3, 3, 2, 2, 3, 2, 2, 3, 2, 3, 3, 1, 4, 2, 2, 4, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 3, 3, 5, 1, 2, 3, 4, 5, 3, 2, 4, 2]

cp's OEIS Frontend

A182595 Number of prime factors of form cn+1 for numbers 2^n+1.

Table of values

List of values

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

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

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