A078720 - cp's OEIS frontend

A078720 Integer part of the ratio of even to odd terms among n, f(n), f(f(n)), ...., 1 for the Collatz function (that is, until reaching "1" for the first time), or -1 if 1 is never reached.

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	3
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	4
17	2
18	2
19	2
20	3
21	3
22	2
23	2
24	2
25	2
26	2
27	1
28	2
29	2
30	2
31	1
32	5
33	2
34	2
35	2
36	2
37	2
38	2
39	1
40	3
41	1
42	3
43	2
44	2
45	2
46	2
47	1
48	3
49	2
50	2
51	2
52	3
53	3
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	1
63	1
64	6
65	2
66	2
67	2
68	2
69	2
70	2
71	1
72	2
73	1
74	2
75	2
76	2
77	2
78	2
79	2
80	4
81	2
82	1
83	1
84	4
85	4
86	2
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	1
95	1
96	3
97	1
98	2
99	2
100	2

[0, 1, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 5, 2, 2, 2, 2, 2, 2, 1, 3, 1, 3, 2, 2, 2, 2, 1, 3, 2, 2, 2, 3, 3, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 6, 2, 2, 2, 2, 2, 2, 1, 2, 1, 2, 2, 2, 2, 2, 2, 4, 2, 1, 1, 4, 4, 2, 2, 2, 2, 2, 1, 2, 2, 1, 1, 3, 1, 2, 2, 2]

cp's OEIS Frontend

A078720 Integer part of the ratio of even to odd terms among n, f(n), f(f(n)), ...., 1 for the Collatz function (that is, until reaching "1" for the first time), or -1 if 1 is never reached.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	3
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	4
17	2
18	2
19	2
20	3
21	3
22	2
23	2
24	2
25	2
26	2
27	1
28	2
29	2
30	2
31	1
32	5
33	2
34	2
35	2
36	2
37	2
38	2
39	1
40	3
41	1
42	3
43	2
44	2
45	2
46	2
47	1
48	3
49	2
50	2
51	2
52	3
53	3
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	1
63	1
64	6
65	2
66	2
67	2
68	2
69	2
70	2
71	1
72	2
73	1
74	2
75	2
76	2
77	2
78	2
79	2
80	4
81	2
82	1
83	1
84	4
85	4
86	2
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	1
95	1
96	3
97	1
98	2
99	2
100	2

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	3
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	4
17	2
18	2
19	2
20	3
21	3
22	2
23	2
24	2
25	2
26	2
27	1
28	2
29	2
30	2
31	1
32	5
33	2
34	2
35	2
36	2
37	2
38	2
39	1
40	3
41	1
42	3
43	2
44	2
45	2
46	2
47	1
48	3
49	2
50	2
51	2
52	3
53	3
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	1
63	1
64	6
65	2
66	2
67	2
68	2
69	2
70	2
71	1
72	2
73	1
74	2
75	2
76	2
77	2
78	2
79	2
80	4
81	2
82	1
83	1
84	4
85	4
86	2
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	1
95	1
96	3
97	1
98	2
99	2
100	2

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	2
7	1
8	3
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	4
17	2
18	2
19	2
20	3
21	3
22	2
23	2
24	2
25	2
26	2
27	1
28	2
29	2
30	2
31	1
32	5
33	2
34	2
35	2
36	2
37	2
38	2
39	1
40	3
41	1
42	3
43	2
44	2
45	2
46	2
47	1
48	3
49	2
50	2
51	2
52	3
53	3
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	1
63	1
64	6
65	2
66	2
67	2
68	2
69	2
70	2
71	1
72	2
73	1
74	2
75	2
76	2
77	2
78	2
79	2
80	4
81	2
82	1
83	1
84	4
85	4
86	2
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	1
95	1
96	3
97	1
98	2
99	2
100	2