A127933 - cp's OEIS frontend

A127933 Number of halving and tripling steps to reach 1 from the n-th pure hailstone number in the '3x+1' problem.

n	a(n)
1	0
2	0
3	7
4	8
5	16
6	19
7	9
8	17
9	20
10	20
11	7
12	10
13	23
14	111
15	18
16	26
17	21
18	21
19	34
20	8
21	29
22	16
23	11
24	24
25	112
26	112
27	32
28	19
29	107
30	27
31	14
32	22
33	115
34	14
35	35
36	35
37	22
38	9
39	30
40	17
41	17
42	12
43	118
44	25
45	25
46	38
47	113
48	113
49	69
50	33
51	33
52	20
53	20
54	46
55	108
56	46
57	121
58	28
59	28
60	41
61	15
62	15
63	23
64	116
65	116

[0, 0, 7, 8, 16, 19, 9, 17, 20, 20, 7, 10, 23, 111, 18, 26, 21, 21, 34, 8, 29, 16, 11, 24, 112, 112, 32, 19, 107, 27, 14, 22, 115, 14, 35, 35, 22, 9, 30, 17, 17, 12, 118, 25, 25, 38, 113, 113, 69, 33, 33, 20, 20, 46, 108, 46, 121, 28, 28, 41, 15, 15, 23, 116, 116]

cp's OEIS Frontend

A127933 Number of halving and tripling steps to reach 1 from the n-th pure hailstone number in the '3x+1' problem.

Table of values

List of values

n	a(n)
1	0
2	0
3	7
4	8
5	16
6	19
7	9
8	17
9	20
10	20
11	7
12	10
13	23
14	111
15	18
16	26
17	21
18	21
19	34
20	8
21	29
22	16
23	11
24	24
25	112
26	112
27	32
28	19
29	107
30	27
31	14
32	22
33	115
34	14
35	35
36	35
37	22
38	9
39	30
40	17
41	17
42	12
43	118
44	25
45	25
46	38
47	113
48	113
49	69
50	33
51	33
52	20
53	20
54	46
55	108
56	46
57	121
58	28
59	28
60	41
61	15
62	15
63	23
64	116
65	116

n	a(n)
1	0
2	0
3	7
4	8
5	16
6	19
7	9
8	17
9	20
10	20
11	7
12	10
13	23
14	111
15	18
16	26
17	21
18	21
19	34
20	8
21	29
22	16
23	11
24	24
25	112
26	112
27	32
28	19
29	107
30	27
31	14
32	22
33	115
34	14
35	35
36	35
37	22
38	9
39	30
40	17
41	17
42	12
43	118
44	25
45	25
46	38
47	113
48	113
49	69
50	33
51	33
52	20
53	20
54	46
55	108
56	46
57	121
58	28
59	28
60	41
61	15
62	15
63	23
64	116
65	116

n	a(n)
1	0
2	0
3	7
4	8
5	16
6	19
7	9
8	17
9	20
10	20
11	7
12	10
13	23
14	111
15	18
16	26
17	21
18	21
19	34
20	8
21	29
22	16
23	11
24	24
25	112
26	112
27	32
28	19
29	107
30	27
31	14
32	22
33	115
34	14
35	35
36	35
37	22
38	9
39	30
40	17
41	17
42	12
43	118
44	25
45	25
46	38
47	113
48	113
49	69
50	33
51	33
52	20
53	20
54	46
55	108
56	46
57	121
58	28
59	28
60	41
61	15
62	15
63	23
64	116
65	116