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A233930 as a simple table

n a(n)
1 3
2 7
3 17
4 31
5 127
6 257
7 3583
8 5119
9 6143
10 8191
11 65537
12 131071
13 524287
14 7340033
15 14680063
16 104857601
17 109051903
18 167772161
19 469762049
20 2013265921
21 2147483647
22 21474836479
23 51539607551
24 206158430209
25 824633720831
26 2748779069441
27 6597069766657
28 26388279066623

[3,7,17,31,127,257,3583,5119,6143,8191,65537,
 131071,524287,7340033,14680063,104857601,
 109051903,167772161,469762049,2013265921,
 2147483647,21474836479,51539607551,206158430209,
 824633720831,2748779069441,6597069766657,
 26388279066623]

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)