A220421 - cp's OEIS frontend

A220421 Number of halving and tripling steps to reach the largest value in the Collatz (3x+1) trajectory of n.

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

[0, 0, 3, 0, 1, 4, 5, 0, 8, 2, 3, 5, 1, 6, 7, 0, 1, 9, 3, 0, 1, 4, 5, 0, 6, 2, 77, 7, 1, 8, 72, 0, 1, 2, 3, 10, 1, 4, 10, 0, 75, 2, 3, 5, 1, 6, 70, 0, 1, 7, 3, 0, 1, 78, 78, 0, 6, 2, 8, 9, 1, 73, 73, 0, 1, 2, 3, 0, 1, 4, 68, 0, 81, 2, 3, 5, 1, 11, 7, 0, 1, 76]

cp's OEIS Frontend

A220421 Number of halving and tripling steps to reach the largest value in the Collatz (3x+1) trajectory of n.

Table of values

List of values

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

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

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