A070975 - cp's OEIS frontend

A070975 Number of steps to reach 1 in `3x+1' (or Collatz) problem starting with prime(n).

n	a(n)
1	1
2	7
3	5
4	16
5	14
6	9
7	12
8	20
9	15
10	18
11	106
12	21
13	109
14	29
15	104
16	11
17	32
18	19
19	27
20	102
21	115
22	35
23	110
24	30
25	118
26	25
27	87
28	100
29	113
30	12
31	46
32	28
33	90
34	41
35	23
36	15
37	36
38	23
39	67
40	31
41	31
42	18
43	44
44	119
45	26
46	119
47	39
48	70
49	13
50	34
51	83
52	52
53	21
54	65
55	122
56	78
57	29
58	42
59	16
60	42
61	60
62	117
63	37
64	86
65	130
66	37
67	24

[1, 7, 5, 16, 14, 9, 12, 20, 15, 18, 106, 21, 109, 29, 104, 11, 32, 19, 27, 102, 115, 35, 110, 30, 118, 25, 87, 100, 113, 12, 46, 28, 90, 41, 23, 15, 36, 23, 67, 31, 31, 18, 44, 119, 26, 119, 39, 70, 13, 34, 83, 52, 21, 65, 122, 78, 29, 42, 16, 42, 60, 117, 37, 86, 130, 37, 24]

cp's OEIS Frontend

A070975 Number of steps to reach 1 in `3x+1' (or Collatz) problem starting with prime(n).

Table of values

List of values

n	a(n)
1	1
2	7
3	5
4	16
5	14
6	9
7	12
8	20
9	15
10	18
11	106
12	21
13	109
14	29
15	104
16	11
17	32
18	19
19	27
20	102
21	115
22	35
23	110
24	30
25	118
26	25
27	87
28	100
29	113
30	12
31	46
32	28
33	90
34	41
35	23
36	15
37	36
38	23
39	67
40	31
41	31
42	18
43	44
44	119
45	26
46	119
47	39
48	70
49	13
50	34
51	83
52	52
53	21
54	65
55	122
56	78
57	29
58	42
59	16
60	42
61	60
62	117
63	37
64	86
65	130
66	37
67	24

n	a(n)
1	1
2	7
3	5
4	16
5	14
6	9
7	12
8	20
9	15
10	18
11	106
12	21
13	109
14	29
15	104
16	11
17	32
18	19
19	27
20	102
21	115
22	35
23	110
24	30
25	118
26	25
27	87
28	100
29	113
30	12
31	46
32	28
33	90
34	41
35	23
36	15
37	36
38	23
39	67
40	31
41	31
42	18
43	44
44	119
45	26
46	119
47	39
48	70
49	13
50	34
51	83
52	52
53	21
54	65
55	122
56	78
57	29
58	42
59	16
60	42
61	60
62	117
63	37
64	86
65	130
66	37
67	24

n	a(n)
1	1
2	7
3	5
4	16
5	14
6	9
7	12
8	20
9	15
10	18
11	106
12	21
13	109
14	29
15	104
16	11
17	32
18	19
19	27
20	102
21	115
22	35
23	110
24	30
25	118
26	25
27	87
28	100
29	113
30	12
31	46
32	28
33	90
34	41
35	23
36	15
37	36
38	23
39	67
40	31
41	31
42	18
43	44
44	119
45	26
46	119
47	39
48	70
49	13
50	34
51	83
52	52
53	21
54	65
55	122
56	78
57	29
58	42
59	16
60	42
61	60
62	117
63	37
64	86
65	130
66	37
67	24