A145818 - OEIS

A145818 as a simple table

n	a(n)
1	1
2	5
3	17
4	21
5	65
6	69
7	81
8	85
9	257
10	261
11	273
12	277
13	321
14	325
15	337
16	341
17	1025
18	1029
19	1041
20	1045
21	1089
22	1093
23	1105
24	1109
25	1281
26	1285
27	1297
28	1301
29	1345
30	1349
31	1361
32	1365
33	4097
34	4101
35	4113
36	4117
37	4161
38	4165
39	4177
40	4181
41	4353
42	4357
43	4369
44	4373
45	4417
46	4421
47	4433

[1,5,17,21,65,69,81,85,257,261,273,277,321,325, 337,341,1025,1029,1041,1045,1089,1093,1105,1109, 1281,1285,1297,1301,1345,1349,1361,1365,4097,4101, 4113,4117,4161,4165,4177,4181,4353,4357,4369,4373, 4417,4421,4433]