A336914 - cp's OEIS frontend

A336914 Number of steps to reach 1 in '3^x+1' problem (a variation of the Collatz problem), or -1 if 1 is never reached.

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

[0, 1, 4, 2, 11, 2, 9, 5, 7, 5, 7, 5, 5, 5, 16, 3, 5, 3, 5, 3, 16, 3, 14, 3, 9, 3, 14, 3, 9, 3, 9, 12, 14, 12, 22, 12, 14, 12, 7, 12, 5, 12, 5, 12, 7, 12, 5, 12, 7, 12, 5, 12, 5, 12, 20, 12, 5, 12, 16, 12, 5, 12, 14, 3, 12, 3, 5, 3, 14, 3, 5, 3, 14, 3, 5, 3, 5]

cp's OEIS Frontend

A336914 Number of steps to reach 1 in '3^x+1' problem (a variation of the Collatz problem), or -1 if 1 is never reached.

Table of values

List of values

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

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

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