A294643 - cp's OEIS frontend

A294643 Length (= size) of the orbit of n under the "3x+1" map A006370: x -> x/2 if even, 3x+1 if odd. a(n) = -1 in case the orbit would be infinite.

n	a(n)
0	1
1	3
2	3
3	8
4	3
5	6
6	9
7	17
8	4
9	20
10	7
11	15
12	10
13	10
14	18
15	18
16	5
17	13
18	21
19	21
20	8
21	8
22	16
23	16
24	11
25	24
26	11
27	112
28	19
29	19
30	19
31	107
32	6
33	27
34	14
35	14
36	22
37	22
38	22
39	35
40	9
41	110
42	9
43	30
44	17
45	17
46	17
47	105
48	12
49	25
50	25
51	25
52	12
53	12
54	113
55	113
56	20
57	33
58	20
59	33
60	20
61	20
62	108
63	108
64	7
65	28
66	28

[1, 3, 3, 8, 3, 6, 9, 17, 4, 20, 7, 15, 10, 10, 18, 18, 5, 13, 21, 21, 8, 8, 16, 16, 11, 24, 11, 112, 19, 19, 19, 107, 6, 27, 14, 14, 22, 22, 22, 35, 9, 110, 9, 30, 17, 17, 17, 105, 12, 25, 25, 25, 12, 12, 113, 113, 20, 33, 20, 33, 20, 20, 108, 108, 7, 28, 28]

cp's OEIS Frontend

A294643 Length (= size) of the orbit of n under the "3x+1" map A006370: x -> x/2 if even, 3x+1 if odd. a(n) = -1 in case the orbit would be infinite.

Table of values

List of values

n	a(n)
0	1
1	3
2	3
3	8
4	3
5	6
6	9
7	17
8	4
9	20
10	7
11	15
12	10
13	10
14	18
15	18
16	5
17	13
18	21
19	21
20	8
21	8
22	16
23	16
24	11
25	24
26	11
27	112
28	19
29	19
30	19
31	107
32	6
33	27
34	14
35	14
36	22
37	22
38	22
39	35
40	9
41	110
42	9
43	30
44	17
45	17
46	17
47	105
48	12
49	25
50	25
51	25
52	12
53	12
54	113
55	113
56	20
57	33
58	20
59	33
60	20
61	20
62	108
63	108
64	7
65	28
66	28

n	a(n)
0	1
1	3
2	3
3	8
4	3
5	6
6	9
7	17
8	4
9	20
10	7
11	15
12	10
13	10
14	18
15	18
16	5
17	13
18	21
19	21
20	8
21	8
22	16
23	16
24	11
25	24
26	11
27	112
28	19
29	19
30	19
31	107
32	6
33	27
34	14
35	14
36	22
37	22
38	22
39	35
40	9
41	110
42	9
43	30
44	17
45	17
46	17
47	105
48	12
49	25
50	25
51	25
52	12
53	12
54	113
55	113
56	20
57	33
58	20
59	33
60	20
61	20
62	108
63	108
64	7
65	28
66	28

n	a(n)
0	1
1	3
2	3
3	8
4	3
5	6
6	9
7	17
8	4
9	20
10	7
11	15
12	10
13	10
14	18
15	18
16	5
17	13
18	21
19	21
20	8
21	8
22	16
23	16
24	11
25	24
26	11
27	112
28	19
29	19
30	19
31	107
32	6
33	27
34	14
35	14
36	22
37	22
38	22
39	35
40	9
41	110
42	9
43	30
44	17
45	17
46	17
47	105
48	12
49	25
50	25
51	25
52	12
53	12
54	113
55	113
56	20
57	33
58	20
59	33
60	20
61	20
62	108
63	108
64	7
65	28
66	28