A133422 - cp's OEIS frontend

A133422 Number of steps to reach 1 under repeated applications of the "7x+1" map of A133421, or -1 if 1 is never reached.

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

[0, 1, 1, 2, 1, 2, 4, 3, 2, 2, 12, 3, 9, 5, 2, 4, 6, 3, 21, 3, 5, 13, 6, 4, 2, 10, 3, 6, 10, 3, 47, 5, 13, 7, 5, 4, 13, 22, 10, 4, 8, 6, 46, 14, 3, 7, 16, 5, 50, 3, 7, 11, 51, 4, 13, 7, 22, 11, 10, 4, 9, 48, 6, 6, 10, 14, 19, 8, 7, 6, 17, 5, 10, 14, 3, 23, 7, 11, 17, 5, 4, 9, 14, 7, 7, 47, 11, 15]

cp's OEIS Frontend

A133422 Number of steps to reach 1 under repeated applications of the "7x+1" map of A133421, 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	1
6	2
7	4
8	3
9	2
10	2
11	12
12	3
13	9
14	5
15	2
16	4
17	6
18	3
19	21
20	3
21	5
22	13
23	6
24	4
25	2
26	10
27	3
28	6
29	10
30	3
31	47
32	5
33	13
34	7
35	5
36	4
37	13
38	22
39	10
40	4
41	8
42	6
43	46
44	14
45	3
46	7
47	16
48	5
49	50
50	3
51	7
52	11
53	51
54	4
55	13
56	7
57	22
58	11
59	10
60	4
61	9
62	48
63	6
64	6
65	10
66	14
67	19
68	8
69	7
70	6
71	17
72	5
73	10
74	14
75	3
76	23
77	7
78	11
79	17
80	5
81	4
82	9
83	14
84	7
85	7
86	47
87	11
88	15

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

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