A209630 - OEIS

A209630 as a simple table

n	a(n)
1	1
2	2
3	7
4	11
5	13
6	31
7	47
8	59
9	61
10	127
11	191
12	223
13	239
14	251
15	895
16	991
17	1007
18	1019
19	1021
20	2047
21	3071
22	3583
23	3967
24	4031
25	4079
26	4091
27	4093
28	8191
29	15359
30	16127
31	16255
32	16319
33	16351
34	16375
35	16381
36	49151
37	63487
38	65279
39	65407
40	65519
41	65531
42	131071
43	196607
44	229375

[1,2,7,11,13,31,47,59,61,127,191,223,239,251,895, 991,1007,1019,1021,2047,3071,3583,3967,4031,4079, 4091,4093,8191,15359,16127,16255,16319,16351, 16375,16381,49151,63487,65279,65407,65519,65531, 131071,196607,229375]