A352891 - cp's OEIS frontend

A352891 Number of iterations of map x -> A341515(x) needed to reach x < n when starting from x=n, or 0 if such number is never reached. Here A341515 is the Collatz or 3x+1 map (A006370) conjugated by unary-binary-encoding (A156552).

n	a(n)
1	0
2	0
3	1
4	6
5	1
6	3
7	1
8	11
9	1
10	3
11	1
12	9
13	1
14	7
15	1
16	11
17	1
18	3
19	1
20	6
21	1
22	6
23	1
24	9
25	1
26	11
27	1
28	7
29	1
30	1
31	1
32	91
33	1
34	106
35	1
36	5
37	1
38	16
39	1
40	14
41	1
42	4
43	1
44	7
45	1
46	20
47	1
48	89
49	1
50	3
51	1
52	7
53	1
54	3
55	1
56	87
57	1
58	21
59	1
60	1
61	1
62	50
63	1
64	92
65	1
66	5
67	1
68	18
69	1
70	3
71	1
72	8
73	1
74	98
75	1
76	14
77	1
78	5
79	1
80	14
81	1
82	34
83	1
84	6
85	1
86	35
87	1
88	12
89	1
90	2
91	1
92	21
93	1
94	71
95	1
96	90
97	1
98	3

[0, 0, 1, 6, 1, 3, 1, 11, 1, 3, 1, 9, 1, 7, 1, 11, 1, 3, 1, 6, 1, 6, 1, 9, 1, 11, 1, 7, 1, 1, 1, 91, 1, 106, 1, 5, 1, 16, 1, 14, 1, 4, 1, 7, 1, 20, 1, 89, 1, 3, 1, 7, 1, 3, 1, 87, 1, 21, 1, 1, 1, 50, 1, 92, 1, 5, 1, 18, 1, 3, 1, 8, 1, 98, 1, 14, 1, 5, 1, 14, 1, 34, 1, 6, 1, 35, 1, 12, 1, 2, 1, 21, 1, 71, 1, 90, 1, 3]

cp's OEIS Frontend

A352891 Number of iterations of map x -> A341515(x) needed to reach x < n when starting from x=n, or 0 if such number is never reached. Here A341515 is the Collatz or 3x+1 map (A006370) conjugated by unary-binary-encoding (A156552).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	6
5	1
6	3
7	1
8	11
9	1
10	3
11	1
12	9
13	1
14	7
15	1
16	11
17	1
18	3
19	1
20	6
21	1
22	6
23	1
24	9
25	1
26	11
27	1
28	7
29	1
30	1
31	1
32	91
33	1
34	106
35	1
36	5
37	1
38	16
39	1
40	14
41	1
42	4
43	1
44	7
45	1
46	20
47	1
48	89
49	1
50	3
51	1
52	7
53	1
54	3
55	1
56	87
57	1
58	21
59	1
60	1
61	1
62	50
63	1
64	92
65	1
66	5
67	1
68	18
69	1
70	3
71	1
72	8
73	1
74	98
75	1
76	14
77	1
78	5
79	1
80	14
81	1
82	34
83	1
84	6
85	1
86	35
87	1
88	12
89	1
90	2
91	1
92	21
93	1
94	71
95	1
96	90
97	1
98	3

n	a(n)
1	0
2	0
3	1
4	6
5	1
6	3
7	1
8	11
9	1
10	3
11	1
12	9
13	1
14	7
15	1
16	11
17	1
18	3
19	1
20	6
21	1
22	6
23	1
24	9
25	1
26	11
27	1
28	7
29	1
30	1
31	1
32	91
33	1
34	106
35	1
36	5
37	1
38	16
39	1
40	14
41	1
42	4
43	1
44	7
45	1
46	20
47	1
48	89
49	1
50	3
51	1
52	7
53	1
54	3
55	1
56	87
57	1
58	21
59	1
60	1
61	1
62	50
63	1
64	92
65	1
66	5
67	1
68	18
69	1
70	3
71	1
72	8
73	1
74	98
75	1
76	14
77	1
78	5
79	1
80	14
81	1
82	34
83	1
84	6
85	1
86	35
87	1
88	12
89	1
90	2
91	1
92	21
93	1
94	71
95	1
96	90
97	1
98	3

n	a(n)
1	0
2	0
3	1
4	6
5	1
6	3
7	1
8	11
9	1
10	3
11	1
12	9
13	1
14	7
15	1
16	11
17	1
18	3
19	1
20	6
21	1
22	6
23	1
24	9
25	1
26	11
27	1
28	7
29	1
30	1
31	1
32	91
33	1
34	106
35	1
36	5
37	1
38	16
39	1
40	14
41	1
42	4
43	1
44	7
45	1
46	20
47	1
48	89
49	1
50	3
51	1
52	7
53	1
54	3
55	1
56	87
57	1
58	21
59	1
60	1
61	1
62	50
63	1
64	92
65	1
66	5
67	1
68	18
69	1
70	3
71	1
72	8
73	1
74	98
75	1
76	14
77	1
78	5
79	1
80	14
81	1
82	34
83	1
84	6
85	1
86	35
87	1
88	12
89	1
90	2
91	1
92	21
93	1
94	71
95	1
96	90
97	1
98	3