A081169 - cp's OEIS frontend

A081169 Triangle in which n-th row gives trajectory of n (including n itself) under the map x -> x/2 if x is even, x -> 3*x-1 if x is odd, stopping when reaching 1, 5 or 17.

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

[1, 2, 1, 2, 1, 3, 8, 4, 2, 1, 4, 2, 1, 5, 14, 7, 20, 10, 5, 6, 3, 8, 4, 2, 1, 7, 20, 10, 5, 8, 4, 2, 1, 9, 26, 13, 38, 19, 56, 28, 14, 7, 20, 10, 5, 10, 5, 11, 32, 16, 8, 4, 2, 1, 12, 6, 3, 8, 4, 2, 1, 13, 38, 19, 56, 28, 14, 7, 20, 10, 5, 14, 7, 20, 10, 5, 15, 44, 22, 11, 32, 16, 8, 4, 2, 1, 16]

cp's OEIS Frontend

A081169 Triangle in which n-th row gives trajectory of n (including n itself) under the map x -> x/2 if x is even, x -> 3*x-1 if x is odd, stopping when reaching 1, 5 or 17.

Table of values

List of values

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

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

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