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A005420 as a simple table

n a(n)
2 3
3 7
4 5
5 31
6 7
7 127
8 17
9 73
10 31
11 89
12 13
13 8191
14 127
15 151
16 257
17 131071
18 73
19 524287
20 41
21 337
22 683
23 178481
24 241
25 1801
26 8191
27 262657
28 127
29 2089
30 331
31 2147483647
32 65537
33 599479
34 131071
35 122921
36 109
37 616318177
38 524287
39 121369
40 61681
41 164511353
42 5419

[3,7,5,31,7,127,17,73,31,89,13,8191,127,151,257,
 131071,73,524287,41,337,683,178481,241,1801,8191,
 262657,127,2089,331,2147483647,65537,599479,
 131071,122921,109,616318177,524287,121369,61681,
 164511353,5419]

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Last modified December 20 04:40 EST 2014. Contains 252241 sequences.