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A248796 as a simple table

na(n)
13
25
37
417
5257
665537
72200696
82619707
96372796
1040588487
1176466987
1281591196
13118018096
14206569607
15470542487
16525644387
17726638836
18791937616
19971122516
20991172807

[3,5,7,17,257,65537,2200696,2619707,6372796,
 40588487,76466987,81591196,118018096,206569607,
 470542487,525644387,726638836,791937616,971122516,
 991172807]