A060565 - cp's OEIS frontend

A060565 Follow trajectory of 2n+1 in the '3x+1' problem until a lower number is reached; A060445 gives number of steps for this to happen. Sequence gives the first lower number that is reached.

n	a(n)
1	2
2	4
3	5
4	7
5	10
6	10
7	10
8	13
9	11
10	16
11	20
12	19
13	23
14	22
15	23
16	25
17	20
18	28
19	38
20	31
21	37
22	34
23	46
24	37
25	29
26	40
27	47
28	43
29	38
30	46
31	61
32	49
33	38
34	52
35	61
36	55
37	64
38	58
39	76
40	61
41	47
42	64
43	74
44	67
45	61
46	70
47	91
48	73
49	56
50	76
51	61
52	79
53	91
54	82
55	61
56	85
57	65
58	88
59	101
60	91
61	118
62	94
63	77
64	97
65	74
66	100
67	86
68	103

[2, 4, 5, 7, 10, 10, 10, 13, 11, 16, 20, 19, 23, 22, 23, 25, 20, 28, 38, 31, 37, 34, 46, 37, 29, 40, 47, 43, 38, 46, 61, 49, 38, 52, 61, 55, 64, 58, 76, 61, 47, 64, 74, 67, 61, 70, 91, 73, 56, 76, 61, 79, 91, 82, 61, 85, 65, 88, 101, 91, 118, 94, 77, 97, 74, 100, 86, 103]

cp's OEIS Frontend

A060565 Follow trajectory of 2n+1 in the '3x+1' problem until a lower number is reached; A060445 gives number of steps for this to happen. Sequence gives the first lower number that is reached.

Table of values

List of values

n	a(n)
1	2
2	4
3	5
4	7
5	10
6	10
7	10
8	13
9	11
10	16
11	20
12	19
13	23
14	22
15	23
16	25
17	20
18	28
19	38
20	31
21	37
22	34
23	46
24	37
25	29
26	40
27	47
28	43
29	38
30	46
31	61
32	49
33	38
34	52
35	61
36	55
37	64
38	58
39	76
40	61
41	47
42	64
43	74
44	67
45	61
46	70
47	91
48	73
49	56
50	76
51	61
52	79
53	91
54	82
55	61
56	85
57	65
58	88
59	101
60	91
61	118
62	94
63	77
64	97
65	74
66	100
67	86
68	103

n	a(n)
1	2
2	4
3	5
4	7
5	10
6	10
7	10
8	13
9	11
10	16
11	20
12	19
13	23
14	22
15	23
16	25
17	20
18	28
19	38
20	31
21	37
22	34
23	46
24	37
25	29
26	40
27	47
28	43
29	38
30	46
31	61
32	49
33	38
34	52
35	61
36	55
37	64
38	58
39	76
40	61
41	47
42	64
43	74
44	67
45	61
46	70
47	91
48	73
49	56
50	76
51	61
52	79
53	91
54	82
55	61
56	85
57	65
58	88
59	101
60	91
61	118
62	94
63	77
64	97
65	74
66	100
67	86
68	103

n	a(n)
1	2
2	4
3	5
4	7
5	10
6	10
7	10
8	13
9	11
10	16
11	20
12	19
13	23
14	22
15	23
16	25
17	20
18	28
19	38
20	31
21	37
22	34
23	46
24	37
25	29
26	40
27	47
28	43
29	38
30	46
31	61
32	49
33	38
34	52
35	61
36	55
37	64
38	58
39	76
40	61
41	47
42	64
43	74
44	67
45	61
46	70
47	91
48	73
49	56
50	76
51	61
52	79
53	91
54	82
55	61
56	85
57	65
58	88
59	101
60	91
61	118
62	94
63	77
64	97
65	74
66	100
67	86
68	103