A355312 - cp's OEIS frontend

A355312 Irregular triangle read by rows, in which the rows list groups of consecutive integers taking the same number of halving and tripling steps to reach 1 in '3X+1' problem. Groups are in order of the number of steps required, and in numerical order among those with the same number of steps.

n	a(n)
1	20
2	21
3	12
4	13
5	84
6	85
7	52
8	53
9	340
10	341
11	34
12	35
13	212
14	213
15	226
16	227
17	1364
18	1365
19	68
20	69
21	70
22	452
23	453
24	454
25	22
26	23
27	140
28	141
29	150
30	151
31	852
32	853
33	908
34	909
35	5460
36	5461
37	44
38	45
39	46
40	276
41	277
42	300
43	301
44	302
45	1812
46	1813
47	14
48	15
49	92
50	93
51	564
52	565
53	604
54	605
55	3412
56	3413

[20, 21, 12, 13, 84, 85, 52, 53, 340, 341, 34, 35, 212, 213, 226, 227, 1364, 1365, 68, 69, 70, 452, 453, 454, 22, 23, 140, 141, 150, 151, 852, 853, 908, 909, 5460, 5461, 44, 45, 46, 276, 277, 300, 301, 302, 1812, 1813, 14, 15, 92, 93, 564, 565, 604, 605, 3412, 3413]

cp's OEIS Frontend

A355312 Irregular triangle read by rows, in which the rows list groups of consecutive integers taking the same number of halving and tripling steps to reach 1 in '3X+1' problem. Groups are in order of the number of steps required, and in numerical order among those with the same number of steps.

Table of values

List of values