A332455 - cp's OEIS frontend

A332455 Starting from sigma(n)+1, number of tripling steps to reach 1 in '3x+1' problem, or -1 if 1 is never reached.

n	a(n)
1	0
2	0
3	1
4	0
5	5
6	2
7	6
8	0
9	5
10	6
11	2
12	5
13	5
14	7
15	7
16	0
17	6
18	1
19	1
20	9
21	8
22	6
23	7
24	5
25	0
26	9
27	40
28	10
29	39
30	42
31	8
32	0
33	7
34	41
35	7
36	4
37	11
38	5
39	10
40	33
41	9
42	43
43	4
44	1
45	11
46	42
47	7
48	39
49	5
50	38
51	42
52	7
53	41
54	34
55	42
56	34
57	6
58	33
59	5
60	16
61	39
62	43
63	12
64	0
65	1
66	42
67	3
68	15
69	43
70	42
71	42
72	7
73	3
74	10
75	39
76	3
77	43
78	16
79	6
80	14
81	5
82	15
83	1
84	17
85	41
86	8
87	34
88	4
89	33
90	46
91	2
92	16
93	44
94	42
95	34
96	39

[0, 0, 1, 0, 5, 2, 6, 0, 5, 6, 2, 5, 5, 7, 7, 0, 6, 1, 1, 9, 8, 6, 7, 5, 0, 9, 40, 10, 39, 42, 8, 0, 7, 41, 7, 4, 11, 5, 10, 33, 9, 43, 4, 1, 11, 42, 7, 39, 5, 38, 42, 7, 41, 34, 42, 34, 6, 33, 5, 16, 39, 43, 12, 0, 1, 42, 3, 15, 43, 42, 42, 7, 3, 10, 39, 3, 43, 16, 6, 14, 5, 15, 1, 17, 41, 8, 34, 4, 33, 46, 2, 16, 44, 42, 34, 39]

cp's OEIS Frontend

A332455 Starting from sigma(n)+1, number of 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	0
3	1
4	0
5	5
6	2
7	6
8	0
9	5
10	6
11	2
12	5
13	5
14	7
15	7
16	0
17	6
18	1
19	1
20	9
21	8
22	6
23	7
24	5
25	0
26	9
27	40
28	10
29	39
30	42
31	8
32	0
33	7
34	41
35	7
36	4
37	11
38	5
39	10
40	33
41	9
42	43
43	4
44	1
45	11
46	42
47	7
48	39
49	5
50	38
51	42
52	7
53	41
54	34
55	42
56	34
57	6
58	33
59	5
60	16
61	39
62	43
63	12
64	0
65	1
66	42
67	3
68	15
69	43
70	42
71	42
72	7
73	3
74	10
75	39
76	3
77	43
78	16
79	6
80	14
81	5
82	15
83	1
84	17
85	41
86	8
87	34
88	4
89	33
90	46
91	2
92	16
93	44
94	42
95	34
96	39

n	a(n)
1	0
2	0
3	1
4	0
5	5
6	2
7	6
8	0
9	5
10	6
11	2
12	5
13	5
14	7
15	7
16	0
17	6
18	1
19	1
20	9
21	8
22	6
23	7
24	5
25	0
26	9
27	40
28	10
29	39
30	42
31	8
32	0
33	7
34	41
35	7
36	4
37	11
38	5
39	10
40	33
41	9
42	43
43	4
44	1
45	11
46	42
47	7
48	39
49	5
50	38
51	42
52	7
53	41
54	34
55	42
56	34
57	6
58	33
59	5
60	16
61	39
62	43
63	12
64	0
65	1
66	42
67	3
68	15
69	43
70	42
71	42
72	7
73	3
74	10
75	39
76	3
77	43
78	16
79	6
80	14
81	5
82	15
83	1
84	17
85	41
86	8
87	34
88	4
89	33
90	46
91	2
92	16
93	44
94	42
95	34
96	39

n	a(n)
1	0
2	0
3	1
4	0
5	5
6	2
7	6
8	0
9	5
10	6
11	2
12	5
13	5
14	7
15	7
16	0
17	6
18	1
19	1
20	9
21	8
22	6
23	7
24	5
25	0
26	9
27	40
28	10
29	39
30	42
31	8
32	0
33	7
34	41
35	7
36	4
37	11
38	5
39	10
40	33
41	9
42	43
43	4
44	1
45	11
46	42
47	7
48	39
49	5
50	38
51	42
52	7
53	41
54	34
55	42
56	34
57	6
58	33
59	5
60	16
61	39
62	43
63	12
64	0
65	1
66	42
67	3
68	15
69	43
70	42
71	42
72	7
73	3
74	10
75	39
76	3
77	43
78	16
79	6
80	14
81	5
82	15
83	1
84	17
85	41
86	8
87	34
88	4
89	33
90	46
91	2
92	16
93	44
94	42
95	34
96	39