A346369 - cp's OEIS frontend

A346369 a(n) is the number of steps the Collatz trajectory of -n takes to reach a cycle, or -1 if no cycle is ever reached.

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

[0, 0, 3, 1, 0, 4, 0, 2, 7, 0, 5, 5, 5, 0, 8, 3, 0, 8, 3, 0, 6, 6, 1, 6, 0, 6, 3, 1, 9, 9, 4, 4, 11, 0, 9, 9, 0, 4, 12, 1, 0, 7, 7, 7, 5, 2, 12, 7, 9, 0, 7, 7, 15, 4, 0, 2, 28, 10, 10, 10, 0, 5, 15, 5, 36, 12, 3, 0, 18, 10, 18, 10, 7, 0, 5, 5, 13, 13, 13, 2, 18]

cp's OEIS Frontend

A346369 a(n) is the number of steps the Collatz trajectory of -n takes to reach a cycle, or -1 if no cycle is ever reached.

Table of values

List of values

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

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

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