A171255 - OEIS

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A171255 as a simple table

n	a(n)
1	5
2	17
3	19
4	67
5	79
6	4099
7	4111
8	4159
9	65537
10	65539
11	65551
12	65599
13	262147
14	266239
15	1073741827
16	1073741839
17	1073807359
18	309485009821345068724785151

[5,17,19,67,79,4099,4111,4159,65537,65539,65551, 65599,262147,266239,1073741827,1073741839, 1073807359,309485009821345068724785151]