A277336 - cp's OEIS frontend

A277336 Numbers n for which the sum of the odd members and the sum of the even members in the Collatz (3x+1) trajectory are both semiprime.

n	a(n)
1	6
2	12
3	24
4	35
5	61
6	76
7	96
8	118
9	146
10	162
11	230
12	245
13	338
14	362
15	384
16	426
17	444
18	460
19	472
20	580
21	584
22	605
23	642
24	645
25	664
26	697
27	718
28	740
29	790
30	804
31	812
32	814
33	830
34	852
35	877
36	920
37	926
38	954
39	979
40	1098
41	1178
42	1192
43	1216
44	1332
45	1334
46	1406
47	1415
48	1446
49	1452
50	1454
51	1459

[6, 12, 24, 35, 61, 76, 96, 118, 146, 162, 230, 245, 338, 362, 384, 426, 444, 460, 472, 580, 584, 605, 642, 645, 664, 697, 718, 740, 790, 804, 812, 814, 830, 852, 877, 920, 926, 954, 979, 1098, 1178, 1192, 1216, 1332, 1334, 1406, 1415, 1446, 1452, 1454, 1459]

cp's OEIS Frontend

A277336 Numbers n for which the sum of the odd members and the sum of the even members in the Collatz (3x+1) trajectory are both semiprime.

Table of values

List of values