A366604 - cp's OEIS frontend

A366604 Number of distinct prime divisors of 4^n - 1.

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

[1, 2, 2, 3, 3, 4, 3, 4, 4, 5, 4, 6, 3, 6, 6, 5, 3, 8, 3, 7, 6, 7, 4, 9, 7, 7, 6, 8, 6, 11, 3, 7, 8, 7, 9, 12, 5, 7, 7, 9, 5, 12, 5, 10, 11, 9, 6, 12, 5, 12, 10, 10, 6, 12, 11, 11, 8, 9, 6, 15, 3, 8, 11, 9, 9, 14, 5, 10, 8, 15, 6, 17, 6, 10, 13, 11, 10, 16, 5]

cp's OEIS Frontend

A366604 Number of distinct prime divisors of 4^n - 1.

Table of values

List of values

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

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

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