A054992 - cp's OEIS frontend

A054992 Number of prime factors of 2^n + 1 (counted with multiplicity).

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	4
10	3
11	2
12	2
13	2
14	3
15	4
16	1
17	2
18	4
19	2
20	2
21	4
22	3
23	2
24	3
25	4
26	4
27	6
28	2
29	3
30	6
31	2
32	2
33	5
34	4
35	5
36	4
37	3
38	4
39	4
40	2
41	3
42	6
43	2
44	3
45	7
46	5
47	3
48	3
49	3
50	7
51	6
52	3
53	3
54	6
55	6
56	3
57	5
58	3
59	4
60	4
61	2
62	5
63	7
64	2
65	6
66	6
67	3
68	4
69	5
70	7
71	3
72	5
73	3
74	5
75	7
76	4
77	6
78	10
79	2
80	3
81	10
82	5
83	6
84	5
85	4
86	5
87	5
88	4
89	4
90	11
91	6
92	2
93	5
94	4
95	5
96	3
97	5
98	6
99	9
100	6
101	2
102	9
103	3

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

cp's OEIS Frontend

A054992 Number of prime factors of 2^n + 1 (counted with multiplicity).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	4
10	3
11	2
12	2
13	2
14	3
15	4
16	1
17	2
18	4
19	2
20	2
21	4
22	3
23	2
24	3
25	4
26	4
27	6
28	2
29	3
30	6
31	2
32	2
33	5
34	4
35	5
36	4
37	3
38	4
39	4
40	2
41	3
42	6
43	2
44	3
45	7
46	5
47	3
48	3
49	3
50	7
51	6
52	3
53	3
54	6
55	6
56	3
57	5
58	3
59	4
60	4
61	2
62	5
63	7
64	2
65	6
66	6
67	3
68	4
69	5
70	7
71	3
72	5
73	3
74	5
75	7
76	4
77	6
78	10
79	2
80	3
81	10
82	5
83	6
84	5
85	4
86	5
87	5
88	4
89	4
90	11
91	6
92	2
93	5
94	4
95	5
96	3
97	5
98	6
99	9
100	6
101	2
102	9
103	3

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	4
10	3
11	2
12	2
13	2
14	3
15	4
16	1
17	2
18	4
19	2
20	2
21	4
22	3
23	2
24	3
25	4
26	4
27	6
28	2
29	3
30	6
31	2
32	2
33	5
34	4
35	5
36	4
37	3
38	4
39	4
40	2
41	3
42	6
43	2
44	3
45	7
46	5
47	3
48	3
49	3
50	7
51	6
52	3
53	3
54	6
55	6
56	3
57	5
58	3
59	4
60	4
61	2
62	5
63	7
64	2
65	6
66	6
67	3
68	4
69	5
70	7
71	3
72	5
73	3
74	5
75	7
76	4
77	6
78	10
79	2
80	3
81	10
82	5
83	6
84	5
85	4
86	5
87	5
88	4
89	4
90	11
91	6
92	2
93	5
94	4
95	5
96	3
97	5
98	6
99	9
100	6
101	2
102	9
103	3

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	4
10	3
11	2
12	2
13	2
14	3
15	4
16	1
17	2
18	4
19	2
20	2
21	4
22	3
23	2
24	3
25	4
26	4
27	6
28	2
29	3
30	6
31	2
32	2
33	5
34	4
35	5
36	4
37	3
38	4
39	4
40	2
41	3
42	6
43	2
44	3
45	7
46	5
47	3
48	3
49	3
50	7
51	6
52	3
53	3
54	6
55	6
56	3
57	5
58	3
59	4
60	4
61	2
62	5
63	7
64	2
65	6
66	6
67	3
68	4
69	5
70	7
71	3
72	5
73	3
74	5
75	7
76	4
77	6
78	10
79	2
80	3
81	10
82	5
83	6
84	5
85	4
86	5
87	5
88	4
89	4
90	11
91	6
92	2
93	5
94	4
95	5
96	3
97	5
98	6
99	9
100	6
101	2
102	9
103	3