A274472 - cp's OEIS frontend

A274472 Number of iterations of the Collatz recursion required to reach a prime number.

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

[2, 0, 0, 1, 0, 1, 0, 2, 3, 1, 0, 2, 0, 1, 2, 3, 0, 4, 0, 2, 6, 1, 0, 3, 3, 1, 2, 2, 0, 3, 0, 4, 6, 1, 2, 5, 0, 1, 2, 3, 0, 7, 0, 2, 4, 1, 0, 4, 3, 4, 6, 2, 0, 3, 2, 3, 3, 1, 0, 4, 0, 1, 17, 5, 6, 7, 0, 2, 5, 3, 0, 6, 0, 1, 2, 2, 4, 3, 0, 4, 3, 1, 0, 8, 8, 1, 2]

cp's OEIS Frontend

A274472 Number of iterations of the Collatz recursion required to reach a prime number.

Table of values

List of values

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

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

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