A080828 - cp's OEIS frontend

A080828 Triangle read by rows in which n-th row gives trajectory of n (omitting n itself) under the map k -> 3k-1 if k odd, k -> k/2 if k even, stopping when reach 1, 5 or 17.

n	a(n)
2	1
3	8
4	4
5	2
6	1
7	2
8	1
9	14
10	7
11	20
12	10
13	5
14	3
15	8
16	4
17	2
18	1
19	20
20	10
21	5
22	4
23	2
24	1
25	26
26	13
27	38
28	19
29	56
30	28
31	14
32	7
33	20
34	10
35	5
36	5
37	32
38	16
39	8
40	4
41	2
42	1
43	6
44	3
45	8
46	4
47	2
48	1
49	38
50	19
51	56
52	28
53	14
54	7
55	20
56	10
57	5
58	7
59	20
60	10
61	5
62	44
63	22
64	11
65	32
66	16
67	8
68	4
69	2
70	1
71	8
72	4
73	2
74	1
75	50
76	25
77	74
78	37
79	110
80	55
81	164
82	82
83	41
84	122

[1, 8, 4, 2, 1, 2, 1, 14, 7, 20, 10, 5, 3, 8, 4, 2, 1, 20, 10, 5, 4, 2, 1, 26, 13, 38, 19, 56, 28, 14, 7, 20, 10, 5, 5, 32, 16, 8, 4, 2, 1, 6, 3, 8, 4, 2, 1, 38, 19, 56, 28, 14, 7, 20, 10, 5, 7, 20, 10, 5, 44, 22, 11, 32, 16, 8, 4, 2, 1, 8, 4, 2, 1, 50, 25, 74, 37, 110, 55, 164, 82, 41, 122]

cp's OEIS Frontend

A080828 Triangle read by rows in which n-th row gives trajectory of n (omitting n itself) under the map k -> 3k-1 if k odd, k -> k/2 if k even, stopping when reach 1, 5 or 17.

Table of values

List of values

n	a(n)
2	1
3	8
4	4
5	2
6	1
7	2
8	1
9	14
10	7
11	20
12	10
13	5
14	3
15	8
16	4
17	2
18	1
19	20
20	10
21	5
22	4
23	2
24	1
25	26
26	13
27	38
28	19
29	56
30	28
31	14
32	7
33	20
34	10
35	5
36	5
37	32
38	16
39	8
40	4
41	2
42	1
43	6
44	3
45	8
46	4
47	2
48	1
49	38
50	19
51	56
52	28
53	14
54	7
55	20
56	10
57	5
58	7
59	20
60	10
61	5
62	44
63	22
64	11
65	32
66	16
67	8
68	4
69	2
70	1
71	8
72	4
73	2
74	1
75	50
76	25
77	74
78	37
79	110
80	55
81	164
82	82
83	41
84	122

n	a(n)
2	1
3	8
4	4
5	2
6	1
7	2
8	1
9	14
10	7
11	20
12	10
13	5
14	3
15	8
16	4
17	2
18	1
19	20
20	10
21	5
22	4
23	2
24	1
25	26
26	13
27	38
28	19
29	56
30	28
31	14
32	7
33	20
34	10
35	5
36	5
37	32
38	16
39	8
40	4
41	2
42	1
43	6
44	3
45	8
46	4
47	2
48	1
49	38
50	19
51	56
52	28
53	14
54	7
55	20
56	10
57	5
58	7
59	20
60	10
61	5
62	44
63	22
64	11
65	32
66	16
67	8
68	4
69	2
70	1
71	8
72	4
73	2
74	1
75	50
76	25
77	74
78	37
79	110
80	55
81	164
82	82
83	41
84	122

n	a(n)
2	1
3	8
4	4
5	2
6	1
7	2
8	1
9	14
10	7
11	20
12	10
13	5
14	3
15	8
16	4
17	2
18	1
19	20
20	10
21	5
22	4
23	2
24	1
25	26
26	13
27	38
28	19
29	56
30	28
31	14
32	7
33	20
34	10
35	5
36	5
37	32
38	16
39	8
40	4
41	2
42	1
43	6
44	3
45	8
46	4
47	2
48	1
49	38
50	19
51	56
52	28
53	14
54	7
55	20
56	10
57	5
58	7
59	20
60	10
61	5
62	44
63	22
64	11
65	32
66	16
67	8
68	4
69	2
70	1
71	8
72	4
73	2
74	1
75	50
76	25
77	74
78	37
79	110
80	55
81	164
82	82
83	41
84	122