A067905 - OEIS

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A067905 as a simple table

n	a(n)
1	2
2	3
3	5
4	7
5	13
6	17
7	23
8	31
9	55933
10	176777
11	23517191
12	986549121979
13	17400648639910404101
14	2314855893053257675837
15	230183094544225348379651767
16	1275923270962002367060689449590920800609

[2,3,5,7,13,17,23,31,55933,176777,23517191, 986549121979,17400648639910404101, 2314855893053257675837, 230183094544225348379651767, 1275923270962002367060689449590920800609]