A372810 - cp's OEIS frontend

A372810 a(n) is the smallest number whose Collatz trajectory contains n, if trajectories do not terminate at 1 but continue to cycle through 1, 4, 2, 1, 4, 2, 1, ... .

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

[1, 1, 3, 1, 3, 6, 7, 3, 9, 3, 7, 12, 7, 9, 15, 3, 7, 18, 19, 7, 21, 7, 15, 24, 25, 7, 27, 9, 19, 30, 27, 21, 33, 7, 15, 36, 37, 25, 39, 7, 27, 42, 43, 19, 45, 15, 27, 48, 43, 33, 51, 7, 15, 54, 55, 37, 57, 19, 39, 60, 27, 27, 63, 21, 43, 66, 39, 45, 69, 15, 27]

cp's OEIS Frontend

A372810 a(n) is the smallest number whose Collatz trajectory contains n, if trajectories do not terminate at 1 but continue to cycle through 1, 4, 2, 1, 4, 2, 1, ... .

Table of values

List of values

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

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

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