A352893 - cp's OEIS frontend

A352893 Number of iterations of map x -> A352892(x) needed to reach x <= 2 when starting from x=n, or -1 if such number is never reached. Here A352892 is the next odd term in the Collatz or 3x+1 map (A139391) conjugated by unary-binary-encoding (A156552).

n	a(n)
1	0
2	0
3	1
4	2
5	1
6	1
7	1
8	5
9	3
10	6
11	1
12	4
13	1
14	3
15	2
16	5
17	1
18	2
19	1
20	6
21	7
22	8
23	1
24	4
25	3
26	8
27	6
28	3
29	1
30	1
31	1
32	39
33	4
34	44
35	2
36	41
37	1
38	44
39	9
40	11
41	1
42	6
43	1
44	8
45	5
46	10
47	1
48	38
49	3
50	7
51	9
52	8
53	1
54	5
55	7
56	37
57	45
58	10
59	1
60	9
61	1
62	56
63	7
64	39
65	4
66	3
67	1
68	44
69	45
70	40
71	1
72	41
73	1
74	39
75	3
76	44
77	2
78	8
79	1
80	11
81	6
82	15
83	1
84	3
85	9
86	15
87	11
88	13
89	1
90	4
91	7
92	10
93	11
94	32
95	9
96	38

[0, 0, 1, 2, 1, 1, 1, 5, 3, 6, 1, 4, 1, 3, 2, 5, 1, 2, 1, 6, 7, 8, 1, 4, 3, 8, 6, 3, 1, 1, 1, 39, 4, 44, 2, 41, 1, 44, 9, 11, 1, 6, 1, 8, 5, 10, 1, 38, 3, 7, 9, 8, 1, 5, 7, 37, 45, 10, 1, 9, 1, 56, 7, 39, 4, 3, 1, 44, 45, 40, 1, 41, 1, 39, 3, 44, 2, 8, 1, 11, 6, 15, 1, 3, 9, 15, 11, 13, 1, 4, 7, 10, 11, 32, 9, 38]

cp's OEIS Frontend

A352893 Number of iterations of map x -> A352892(x) needed to reach x <= 2 when starting from x=n, or -1 if such number is never reached. Here A352892 is the next odd term in the Collatz or 3x+1 map (A139391) conjugated by unary-binary-encoding (A156552).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	2
5	1
6	1
7	1
8	5
9	3
10	6
11	1
12	4
13	1
14	3
15	2
16	5
17	1
18	2
19	1
20	6
21	7
22	8
23	1
24	4
25	3
26	8
27	6
28	3
29	1
30	1
31	1
32	39
33	4
34	44
35	2
36	41
37	1
38	44
39	9
40	11
41	1
42	6
43	1
44	8
45	5
46	10
47	1
48	38
49	3
50	7
51	9
52	8
53	1
54	5
55	7
56	37
57	45
58	10
59	1
60	9
61	1
62	56
63	7
64	39
65	4
66	3
67	1
68	44
69	45
70	40
71	1
72	41
73	1
74	39
75	3
76	44
77	2
78	8
79	1
80	11
81	6
82	15
83	1
84	3
85	9
86	15
87	11
88	13
89	1
90	4
91	7
92	10
93	11
94	32
95	9
96	38

n	a(n)
1	0
2	0
3	1
4	2
5	1
6	1
7	1
8	5
9	3
10	6
11	1
12	4
13	1
14	3
15	2
16	5
17	1
18	2
19	1
20	6
21	7
22	8
23	1
24	4
25	3
26	8
27	6
28	3
29	1
30	1
31	1
32	39
33	4
34	44
35	2
36	41
37	1
38	44
39	9
40	11
41	1
42	6
43	1
44	8
45	5
46	10
47	1
48	38
49	3
50	7
51	9
52	8
53	1
54	5
55	7
56	37
57	45
58	10
59	1
60	9
61	1
62	56
63	7
64	39
65	4
66	3
67	1
68	44
69	45
70	40
71	1
72	41
73	1
74	39
75	3
76	44
77	2
78	8
79	1
80	11
81	6
82	15
83	1
84	3
85	9
86	15
87	11
88	13
89	1
90	4
91	7
92	10
93	11
94	32
95	9
96	38

n	a(n)
1	0
2	0
3	1
4	2
5	1
6	1
7	1
8	5
9	3
10	6
11	1
12	4
13	1
14	3
15	2
16	5
17	1
18	2
19	1
20	6
21	7
22	8
23	1
24	4
25	3
26	8
27	6
28	3
29	1
30	1
31	1
32	39
33	4
34	44
35	2
36	41
37	1
38	44
39	9
40	11
41	1
42	6
43	1
44	8
45	5
46	10
47	1
48	38
49	3
50	7
51	9
52	8
53	1
54	5
55	7
56	37
57	45
58	10
59	1
60	9
61	1
62	56
63	7
64	39
65	4
66	3
67	1
68	44
69	45
70	40
71	1
72	41
73	1
74	39
75	3
76	44
77	2
78	8
79	1
80	11
81	6
82	15
83	1
84	3
85	9
86	15
87	11
88	13
89	1
90	4
91	7
92	10
93	11
94	32
95	9
96	38