A133420 - cp's OEIS frontend

A133420 Number of steps to reach 1 under repeated applications of the "5x+1" map of A133419, or -1 if 1 is never reached.

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

[0, 1, 1, 2, 14, 2, 5, 3, 2, 15, 9, 3, 12, 6, 15, 4, 9, 3, 7, 16, 6, 10, 21, 4, 9, 13, 3, 7, 18, 16, 16, 5, 10, 10, 14, 4, 19, 8, 13, 17, 13, 7, 7, 11, 16, 22, 26, 5, 16, 10, 10, 14, 25, 4, 25, 8, 8, 19, 23, 17, 13, 17, 7, 6, 17, 11, 11, 11, 22, 15, 26, 5, 16, 20, 10, 9, 20, 14, 14, 18, 4, 14]

cp's OEIS Frontend

A133420 Number of steps to reach 1 under repeated applications of the "5x+1" map of A133419, or -1 if 1 is never reached.

Table of values

List of values

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

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

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