A064684 - cp's OEIS frontend

A064684 Number of primes in orbit of 2n+1 in the 3x+1 problem.

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

[0, 3, 2, 6, 6, 5, 3, 4, 4, 7, 1, 4, 7, 25, 6, 24, 7, 3, 7, 11, 25, 8, 4, 23, 7, 6, 3, 24, 8, 11, 5, 20, 7, 9, 3, 22, 25, 2, 6, 11, 5, 24, 1, 9, 10, 20, 3, 20, 26, 7, 8, 19, 11, 21, 26, 15, 2, 8, 5, 10, 20, 13, 23, 12, 26, 9, 7, 9, 20, 13, 3, 20, 26, 24, 7, 3, 8, 18, 12, 13, 20, 5, 24, 15, 12]

cp's OEIS Frontend

A064684 Number of primes in orbit of 2n+1 in the 3x+1 problem.

Table of values

List of values

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

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

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