A391855 - OEIS

A391855 as a simple table

n	a(n)
1	1
2	3
3	5
4	7
5	31
6	33
7	63
8	65
9	119
10	127
11	129
12	133
13	161
14	195
15	255
16	257
17	261
18	321
19	387
20	455
21	511
22	513
23	517
24	641
25	645
26	771
27	1023
28	1025
29	1029
30	1057
31	1281
32	1285
33	1539
34	1799
35	1823
36	1911
37	1991
38	2047
39	2049
40	2053
41	2081
42	2113
43	2561
44	2565
45	3075
46	3591
47	3647
48	4039
49	4095
50	4097
51	4101
52	4129
53	4161
54	4225
55	4229
56	4257
57	5121
58	5125
59	5153

[1,3,5,7,31,33,63,65,119,127,129,133,161,195,255, 257,261,321,387,455,511,513,517,641,645,771,1023, 1025,1029,1057,1281,1285,1539,1799,1823,1911,1991, 2047,2049,2053,2081,2113,2561,2565,3075,3591,3647, 4039,4095,4097,4101,4129,4161,4225,4229,4257,5121, 5125,5153]