A277068 - cp's OEIS frontend

A277068 a(n) = gcd(s1, s2), where s1 is the sum of the odd numbers and s2 is the sum of the even numbers in the Collatz (3x+1)trajectory of n.

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

[1, 1, 1, 1, 6, 1, 18, 1, 3, 2, 1, 1, 1, 2, 2, 1, 2, 21, 1, 6, 2, 1, 3, 1, 2, 1, 2, 6, 2, 4, 2, 1, 1, 4, 2, 3, 1, 1, 2, 2, 3, 2, 2, 1, 1, 1, 1, 1, 2, 12, 2, 1, 1, 2, 2, 2, 1, 4, 3, 4, 2, 2, 2, 1, 5, 1, 1, 4, 2, 2, 2, 3, 1, 7, 2, 1, 1, 2, 2, 6, 7, 1, 1, 2, 2, 8]

cp's OEIS Frontend

A277068 a(n) = gcd(s1, s2), where s1 is the sum of the odd numbers and s2 is the sum of the even numbers in the Collatz (3x+1)trajectory of n.

Table of values

List of values

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

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

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