A006577 - cp's OEIS frontend

A006577 Number of halving and tripling steps to reach 1 in '3x+1' problem, or -1 if 1 is never reached.

n	a(n)
1	0
2	1
3	7
4	2
5	5
6	8
7	16
8	3
9	19
10	6
11	14
12	9
13	9
14	17
15	17
16	4
17	12
18	20
19	20
20	7
21	7
22	15
23	15
24	10
25	23
26	10
27	111
28	18
29	18
30	18
31	106
32	5
33	26
34	13
35	13
36	21
37	21
38	21
39	34
40	8
41	109
42	8
43	29
44	16
45	16
46	16
47	104
48	11
49	24
50	24
51	24
52	11
53	11
54	112
55	112
56	19
57	32
58	19
59	32
60	19
61	19
62	107
63	107
64	6
65	27
66	27
67	27
68	14
69	14
70	14
71	102
72	22

[0, 1, 7, 2, 5, 8, 16, 3, 19, 6, 14, 9, 9, 17, 17, 4, 12, 20, 20, 7, 7, 15, 15, 10, 23, 10, 111, 18, 18, 18, 106, 5, 26, 13, 13, 21, 21, 21, 34, 8, 109, 8, 29, 16, 16, 16, 104, 11, 24, 24, 24, 11, 11, 112, 112, 19, 32, 19, 32, 19, 19, 107, 107, 6, 27, 27, 27, 14, 14, 14, 102, 22]

cp's OEIS Frontend

A006577 Number of halving and tripling steps to reach 1 in '3x+1' problem, or -1 if 1 is never reached.

Table of values

List of values

n	a(n)
1	0
2	1
3	7
4	2
5	5
6	8
7	16
8	3
9	19
10	6
11	14
12	9
13	9
14	17
15	17
16	4
17	12
18	20
19	20
20	7
21	7
22	15
23	15
24	10
25	23
26	10
27	111
28	18
29	18
30	18
31	106
32	5
33	26
34	13
35	13
36	21
37	21
38	21
39	34
40	8
41	109
42	8
43	29
44	16
45	16
46	16
47	104
48	11
49	24
50	24
51	24
52	11
53	11
54	112
55	112
56	19
57	32
58	19
59	32
60	19
61	19
62	107
63	107
64	6
65	27
66	27
67	27
68	14
69	14
70	14
71	102
72	22

n	a(n)
1	0
2	1
3	7
4	2
5	5
6	8
7	16
8	3
9	19
10	6
11	14
12	9
13	9
14	17
15	17
16	4
17	12
18	20
19	20
20	7
21	7
22	15
23	15
24	10
25	23
26	10
27	111
28	18
29	18
30	18
31	106
32	5
33	26
34	13
35	13
36	21
37	21
38	21
39	34
40	8
41	109
42	8
43	29
44	16
45	16
46	16
47	104
48	11
49	24
50	24
51	24
52	11
53	11
54	112
55	112
56	19
57	32
58	19
59	32
60	19
61	19
62	107
63	107
64	6
65	27
66	27
67	27
68	14
69	14
70	14
71	102
72	22

n	a(n)
1	0
2	1
3	7
4	2
5	5
6	8
7	16
8	3
9	19
10	6
11	14
12	9
13	9
14	17
15	17
16	4
17	12
18	20
19	20
20	7
21	7
22	15
23	15
24	10
25	23
26	10
27	111
28	18
29	18
30	18
31	106
32	5
33	26
34	13
35	13
36	21
37	21
38	21
39	34
40	8
41	109
42	8
43	29
44	16
45	16
46	16
47	104
48	11
49	24
50	24
51	24
52	11
53	11
54	112
55	112
56	19
57	32
58	19
59	32
60	19
61	19
62	107
63	107
64	6
65	27
66	27
67	27
68	14
69	14
70	14
71	102
72	22