A224166 - cp's OEIS frontend

A224166 Number of halving and tripling steps to reach the last number of the cycle in the Collatz (3x+1) problem for the negative integers (the initial term is counted).

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

[2, 2, 5, 3, 5, 6, 5, 4, 12, 5, 7, 7, 10, 5, 10, 5, 18, 13, 8, 5, 24, 8, 19, 8, 18, 11, 8, 6, 11, 11, 22, 6, 29, 18, 14, 14, 18, 9, 14, 6, 18, 25, 9, 9, 23, 20, 17, 9, 27, 18, 12, 12, 17, 9, 18, 7, 30, 12, 12, 12, 18, 23, 20, 7, 38, 30, 21, 18, 20, 15, 20, 15]

cp's OEIS Frontend

A224166 Number of halving and tripling steps to reach the last number of the cycle in the Collatz (3x+1) problem for the negative integers (the initial term is counted).

Table of values

List of values

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

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

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