A067390 - cp's OEIS frontend

A067390 Number of distinct prime factors in 2^n + 3.

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

[1, 1, 1, 1, 2, 1, 1, 2, 2, 2, 2, 1, 3, 2, 1, 1, 3, 1, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 4, 1, 3, 2, 4, 3, 2, 3, 3, 2, 2, 2, 3, 2, 4, 4, 2, 2, 3, 2, 3, 3, 4, 2, 5, 2, 1, 3, 3, 3, 4, 3, 2, 2, 4, 2, 5, 2, 1, 5, 3, 3, 3, 3, 3, 4, 4, 2, 4, 3, 4, 5, 4, 4, 5, 1, 4, 4, 2, 3, 5, 4, 4, 4, 4, 5, 4, 4, 6, 3, 2, 2]

cp's OEIS Frontend

A067390 Number of distinct prime factors in 2^n + 3.

Table of values

List of values

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

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

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