A332454 - cp's OEIS frontend

A332454 Starting from sigma(n)+1, number of halving steps to reach 1 in '3x+1' problem, or -1 if this never happens.

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

[1, 2, 4, 3, 11, 7, 13, 4, 12, 14, 7, 13, 12, 16, 16, 5, 14, 7, 6, 20, 18, 15, 16, 14, 5, 20, 69, 22, 67, 73, 18, 6, 17, 71, 17, 13, 23, 14, 22, 59, 20, 75, 12, 8, 24, 73, 17, 69, 14, 67, 73, 18, 71, 61, 73, 61, 16, 59, 14, 33, 68, 75, 26, 7, 8, 74, 11, 31, 75, 74, 73, 19, 11, 23, 69, 12, 75, 33, 16, 30, 15, 31, 8, 35, 72, 20]

cp's OEIS Frontend

A332454 Starting from sigma(n)+1, number of halving steps to reach 1 in '3x+1' problem, or -1 if this never happens.

Table of values

List of values

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

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

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