A352890 - cp's OEIS frontend

A352890 Number of iterations of map x -> A341515(x) needed to reach x <= 2 when starting from x=n, or -1 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	7
5	2
6	5
7	3
8	16
9	8
10	19
11	4
12	14
13	5
14	12
15	6
16	17
17	6
18	9
19	7
20	20
21	20
22	26
23	8
24	15
25	9
26	27
27	17
28	13
29	9
30	7
31	10
32	106
33	13
34	121
35	7
36	111
37	11
38	122
39	27
40	34
41	12
42	21
43	13
44	27
45	15
46	35
47	14
48	104
49	10
50	23
51	28
52	28
53	15
54	18
55	21
56	102
57	122
58	36
59	16
60	29
61	17
62	156
63	21
64	107
65	14
66	14
67	18
68	122
69	123
70	109
71	19
72	112
73	20
74	113
75	10
76	123
77	8
78	28
79	21
80	35

[0, 0, 1, 7, 2, 5, 3, 16, 8, 19, 4, 14, 5, 12, 6, 17, 6, 9, 7, 20, 20, 26, 8, 15, 9, 27, 17, 13, 9, 7, 10, 106, 13, 121, 7, 111, 11, 122, 27, 34, 12, 21, 13, 27, 15, 35, 14, 104, 10, 23, 28, 28, 15, 18, 21, 102, 122, 36, 16, 29, 17, 156, 21, 107, 14, 14, 18, 122, 123, 109, 19, 112, 20, 113, 10, 123, 8, 28, 21, 35]

cp's OEIS Frontend

A352890 Number of iterations of map x -> A341515(x) needed to reach x <= 2 when starting from x=n, or -1 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	7
5	2
6	5
7	3
8	16
9	8
10	19
11	4
12	14
13	5
14	12
15	6
16	17
17	6
18	9
19	7
20	20
21	20
22	26
23	8
24	15
25	9
26	27
27	17
28	13
29	9
30	7
31	10
32	106
33	13
34	121
35	7
36	111
37	11
38	122
39	27
40	34
41	12
42	21
43	13
44	27
45	15
46	35
47	14
48	104
49	10
50	23
51	28
52	28
53	15
54	18
55	21
56	102
57	122
58	36
59	16
60	29
61	17
62	156
63	21
64	107
65	14
66	14
67	18
68	122
69	123
70	109
71	19
72	112
73	20
74	113
75	10
76	123
77	8
78	28
79	21
80	35

n	a(n)
1	0
2	0
3	1
4	7
5	2
6	5
7	3
8	16
9	8
10	19
11	4
12	14
13	5
14	12
15	6
16	17
17	6
18	9
19	7
20	20
21	20
22	26
23	8
24	15
25	9
26	27
27	17
28	13
29	9
30	7
31	10
32	106
33	13
34	121
35	7
36	111
37	11
38	122
39	27
40	34
41	12
42	21
43	13
44	27
45	15
46	35
47	14
48	104
49	10
50	23
51	28
52	28
53	15
54	18
55	21
56	102
57	122
58	36
59	16
60	29
61	17
62	156
63	21
64	107
65	14
66	14
67	18
68	122
69	123
70	109
71	19
72	112
73	20
74	113
75	10
76	123
77	8
78	28
79	21
80	35

n	a(n)
1	0
2	0
3	1
4	7
5	2
6	5
7	3
8	16
9	8
10	19
11	4
12	14
13	5
14	12
15	6
16	17
17	6
18	9
19	7
20	20
21	20
22	26
23	8
24	15
25	9
26	27
27	17
28	13
29	9
30	7
31	10
32	106
33	13
34	121
35	7
36	111
37	11
38	122
39	27
40	34
41	12
42	21
43	13
44	27
45	15
46	35
47	14
48	104
49	10
50	23
51	28
52	28
53	15
54	18
55	21
56	102
57	122
58	36
59	16
60	29
61	17
62	156
63	21
64	107
65	14
66	14
67	18
68	122
69	123
70	109
71	19
72	112
73	20
74	113
75	10
76	123
77	8
78	28
79	21
80	35