A277367 - cp's OEIS frontend

A277367 a(n) = gcd(A006666(n), A006667(n)) where A006666 and A006667 are respectively the number of halving and tripling steps in the '3x+1' problem.

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

[0, 1, 1, 2, 1, 2, 1, 3, 1, 1, 2, 1, 1, 1, 1, 4, 3, 2, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 5, 2, 1, 1, 3, 3, 3, 1, 1, 1, 1, 1, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 6, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 1, 1, 1, 2, 10, 10, 1, 1, 3, 3]

cp's OEIS Frontend

A277367 a(n) = gcd(A006666(n), A006667(n)) where A006666 and A006667 are respectively the number of halving and tripling steps in the '3x+1' problem.

Table of values

List of values

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

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

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