A213209 - cp's OEIS frontend

A213209 Number of isolated even numbers in Collatz (3x+1) trajectory of n.

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

[0, 1, 1, 0, 0, 2, 2, 0, 2, 1, 1, 1, 0, 3, 3, 0, 0, 3, 2, 0, 0, 2, 2, 1, 2, 1, 24, 2, 1, 4, 23, 0, 2, 1, 1, 2, 2, 3, 5, 0, 23, 1, 3, 1, 0, 3, 22, 1, 2, 3, 2, 0, 0, 25, 24, 2, 3, 2, 4, 3, 2, 24, 24, 0, 2, 3, 3, 0, 0, 2, 21, 2, 24, 3, 1, 2, 1, 6, 5, 0, 2, 24, 23, 0]

cp's OEIS Frontend

A213209 Number of isolated even numbers in Collatz (3x+1) trajectory of n.

Table of values

List of values

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

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

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