A332209 - cp's OEIS frontend

A332209 Starting from sigma(n), 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	7
3	2
4	16
5	8
6	9
7	3
8	17
9	9
10	20
11	9
12	18
13	17
14	10
15	10
16	106
17	20
18	34
19	7
20	8
21	5
22	21
23	10
24	19
25	106
26	8
27	8
28	19
29	18
30	22
31	5
32	107
33	11
34	112
35	11
36	92
37	21
38	19
39	19
40	17
41	8
42	12
43	16
44	9
45	35
46	22
47	11
48	108
49	32
50	17
51	22
52	25
53	112
54	20
55	22
56	20
57	9
58	17
59	19
60	10
61	107
62	12
63	12
64	46
65	9
66	23
67	14
68	108
69	12
70	23
71	22
72	119
73	22
74	33
75	108
76	15
77	12
78	10
79	9
80	18
81	95
82	108
83	9
84	21
85	113
86	28
87	20
88	18
89	17

[0, 7, 2, 16, 8, 9, 3, 17, 9, 20, 9, 18, 17, 10, 10, 106, 20, 34, 7, 8, 5, 21, 10, 19, 106, 8, 8, 19, 18, 22, 5, 107, 11, 112, 11, 92, 21, 19, 19, 17, 8, 12, 16, 9, 35, 22, 11, 108, 32, 17, 22, 25, 112, 20, 22, 20, 9, 17, 19, 10, 107, 12, 12, 46, 9, 23, 14, 108, 12, 23, 22, 119, 22, 33, 108, 15, 12, 10, 9, 18, 95, 108, 9, 21, 113, 28, 20, 18, 17]

cp's OEIS Frontend

A332209 Starting from sigma(n), 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	7
3	2
4	16
5	8
6	9
7	3
8	17
9	9
10	20
11	9
12	18
13	17
14	10
15	10
16	106
17	20
18	34
19	7
20	8
21	5
22	21
23	10
24	19
25	106
26	8
27	8
28	19
29	18
30	22
31	5
32	107
33	11
34	112
35	11
36	92
37	21
38	19
39	19
40	17
41	8
42	12
43	16
44	9
45	35
46	22
47	11
48	108
49	32
50	17
51	22
52	25
53	112
54	20
55	22
56	20
57	9
58	17
59	19
60	10
61	107
62	12
63	12
64	46
65	9
66	23
67	14
68	108
69	12
70	23
71	22
72	119
73	22
74	33
75	108
76	15
77	12
78	10
79	9
80	18
81	95
82	108
83	9
84	21
85	113
86	28
87	20
88	18
89	17

n	a(n)
1	0
2	7
3	2
4	16
5	8
6	9
7	3
8	17
9	9
10	20
11	9
12	18
13	17
14	10
15	10
16	106
17	20
18	34
19	7
20	8
21	5
22	21
23	10
24	19
25	106
26	8
27	8
28	19
29	18
30	22
31	5
32	107
33	11
34	112
35	11
36	92
37	21
38	19
39	19
40	17
41	8
42	12
43	16
44	9
45	35
46	22
47	11
48	108
49	32
50	17
51	22
52	25
53	112
54	20
55	22
56	20
57	9
58	17
59	19
60	10
61	107
62	12
63	12
64	46
65	9
66	23
67	14
68	108
69	12
70	23
71	22
72	119
73	22
74	33
75	108
76	15
77	12
78	10
79	9
80	18
81	95
82	108
83	9
84	21
85	113
86	28
87	20
88	18
89	17

n	a(n)
1	0
2	7
3	2
4	16
5	8
6	9
7	3
8	17
9	9
10	20
11	9
12	18
13	17
14	10
15	10
16	106
17	20
18	34
19	7
20	8
21	5
22	21
23	10
24	19
25	106
26	8
27	8
28	19
29	18
30	22
31	5
32	107
33	11
34	112
35	11
36	92
37	21
38	19
39	19
40	17
41	8
42	12
43	16
44	9
45	35
46	22
47	11
48	108
49	32
50	17
51	22
52	25
53	112
54	20
55	22
56	20
57	9
58	17
59	19
60	10
61	107
62	12
63	12
64	46
65	9
66	23
67	14
68	108
69	12
70	23
71	22
72	119
73	22
74	33
75	108
76	15
77	12
78	10
79	9
80	18
81	95
82	108
83	9
84	21
85	113
86	28
87	20
88	18
89	17