A347409 - cp's OEIS frontend

A347409 Longest run of halving steps in the trajectory from n to 1 in the Collatz map (or 3x+1 problem), or -1 if no such trajectory exists.

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

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

cp's OEIS Frontend

A347409 Longest run of halving steps in the trajectory from n to 1 in the Collatz map (or 3x+1 problem), or -1 if no such trajectory exists.

Table of values

List of values

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

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

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