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A003424 as a simple table

na(n)
13
25
37
413
517
631
773
8127
9257
10307
11757
121093
131723
142801
153541
165113
178011
188191
1910303
2017293
2119531
2228057
2330103
2430941
2565537
2686143
2788741
28131071
29147073

[3,5,7,13,17,31,73,127,257,307,757,1093,1723,2801,
 3541,5113,8011,8191,10303,17293,19531,28057,30103,
 30941,65537,86143,88741,131071,147073]