A160541 - cp's OEIS frontend

A160541 Number of odd-then-even runs to reach 1 from n under the modified "3x+1" map: x -> x/2 if x is even, x -> (3x+1)/2 if x is odd.

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	3
8	1
9	4
10	2
11	3
12	2
13	2
14	4
15	2
16	1
17	3
18	5
19	4
20	2
21	1
22	4
23	2
24	2
25	5
26	3
27	17
28	4
29	4
30	3
31	16
32	1
33	6
34	4
35	2
36	5
37	4
38	5
39	6
40	2
41	17
42	2
43	6
44	4
45	4
46	3
47	16
48	2
49	5
50	6
51	5
52	3
53	2
54	18
55	17
56	4
57	7
58	5
59	6
60	3
61	3
62	17
63	15
64	1
65	6
66	7
67	5
68	4
69	3
70	3
71	16
72	5
73	18
74	5
75	2
76	5
77	5
78	7
79	6
80	2
81	4
82	18
83	17

[0, 1, 1, 1, 1, 2, 3, 1, 4, 2, 3, 2, 2, 4, 2, 1, 3, 5, 4, 2, 1, 4, 2, 2, 5, 3, 17, 4, 4, 3, 16, 1, 6, 4, 2, 5, 4, 5, 6, 2, 17, 2, 6, 4, 4, 3, 16, 2, 5, 6, 5, 3, 2, 18, 17, 4, 7, 5, 6, 3, 3, 17, 15, 1, 6, 7, 5, 4, 3, 3, 16, 5, 18, 5, 2, 5, 5, 7, 6, 2, 4, 18, 17]

cp's OEIS Frontend

A160541 Number of odd-then-even runs to reach 1 from n under the modified "3x+1" map: x -> x/2 if x is even, x -> (3x+1)/2 if x is odd.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	3
8	1
9	4
10	2
11	3
12	2
13	2
14	4
15	2
16	1
17	3
18	5
19	4
20	2
21	1
22	4
23	2
24	2
25	5
26	3
27	17
28	4
29	4
30	3
31	16
32	1
33	6
34	4
35	2
36	5
37	4
38	5
39	6
40	2
41	17
42	2
43	6
44	4
45	4
46	3
47	16
48	2
49	5
50	6
51	5
52	3
53	2
54	18
55	17
56	4
57	7
58	5
59	6
60	3
61	3
62	17
63	15
64	1
65	6
66	7
67	5
68	4
69	3
70	3
71	16
72	5
73	18
74	5
75	2
76	5
77	5
78	7
79	6
80	2
81	4
82	18
83	17

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	3
8	1
9	4
10	2
11	3
12	2
13	2
14	4
15	2
16	1
17	3
18	5
19	4
20	2
21	1
22	4
23	2
24	2
25	5
26	3
27	17
28	4
29	4
30	3
31	16
32	1
33	6
34	4
35	2
36	5
37	4
38	5
39	6
40	2
41	17
42	2
43	6
44	4
45	4
46	3
47	16
48	2
49	5
50	6
51	5
52	3
53	2
54	18
55	17
56	4
57	7
58	5
59	6
60	3
61	3
62	17
63	15
64	1
65	6
66	7
67	5
68	4
69	3
70	3
71	16
72	5
73	18
74	5
75	2
76	5
77	5
78	7
79	6
80	2
81	4
82	18
83	17

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	2
7	3
8	1
9	4
10	2
11	3
12	2
13	2
14	4
15	2
16	1
17	3
18	5
19	4
20	2
21	1
22	4
23	2
24	2
25	5
26	3
27	17
28	4
29	4
30	3
31	16
32	1
33	6
34	4
35	2
36	5
37	4
38	5
39	6
40	2
41	17
42	2
43	6
44	4
45	4
46	3
47	16
48	2
49	5
50	6
51	5
52	3
53	2
54	18
55	17
56	4
57	7
58	5
59	6
60	3
61	3
62	17
63	15
64	1
65	6
66	7
67	5
68	4
69	3
70	3
71	16
72	5
73	18
74	5
75	2
76	5
77	5
78	7
79	6
80	2
81	4
82	18
83	17