A129738 - OEIS

A129738 as a simple table

n	a(n)
1	3
2	5
3	11
4	7
5	43
6	17
7	19
8	31
9	683
10	13
11	2731
12	127
13	331
14	257
15	43691
16	73
17	174763
18	41
19	5419
20	23
21	89
22	2796203
23	241
24	251
25	4051
26	8191
27	87211
28	29
29	113
30	59
31	3033169
32	151
33	715827883
34	65537
35	67
36	20857
37	131071
38	281
39	86171
40	37
41	109
42	1777
43	25781083
44	524287
45	22366891
46	61681
47	83

[3,5,11,7,43,17,19,31,683,13,2731,127,331,257, 43691,73,174763,41,5419,23,89,2796203,241,251, 4051,8191,87211,29,113,59,3033169,151,715827883, 65537,67,20857,131071,281,86171,37,109,1777, 25781083,524287,22366891,61681,83]

[3,5,11,7,43,17,19,31,683,13,2731,127,331,257,
 43691,73,174763,41,5419,23,89,2796203,241,251,
 4051,8191,87211,29,113,59,3033169,151,715827883,
 65537,67,20857,131071,281,86171,37,109,1777,
 25781083,524287,22366891,61681,83]