A301937 - cp's OEIS frontend

A301937 a(n) is the smallest number whose Collatz ('3x+1') trajectory crosses its initial value exactly n times.

n	a(n)
0	1
1	3
2	10
3	7
4	6
5	9
6	22
7	19
8	14
9	25
10	18
11	83
12	62
13	33
14	54
15	559
16	108
17	109
18	110
19	97
20	188
21	147
22	166
23	221
24	146
25	171
26	292
27	129
28	194
29	257
30	294
31	313
32	342
33	399
34	506
35	609
36	462
37	353
38	398
39	531
40	834
41	471
42	530
43	1153
44	9854
45	417
46	470
47	627
48	8758
49	9853
50	626
51	9225
52	18450
53	20609
54	23718

[1, 3, 10, 7, 6, 9, 22, 19, 14, 25, 18, 83, 62, 33, 54, 559, 108, 109, 110, 97, 188, 147, 166, 221, 146, 171, 292, 129, 194, 257, 294, 313, 342, 399, 506, 609, 462, 353, 398, 531, 834, 471, 530, 1153, 9854, 417, 470, 627, 8758, 9853, 626, 9225, 18450, 20609, 23718]

cp's OEIS Frontend

A301937 a(n) is the smallest number whose Collatz ('3x+1') trajectory crosses its initial value exactly n times.

Table of values

List of values