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A228471 as a simple table

na(n)
03
15
219
331
4117
5191
6721
71177
84443
97253
1027379
1144695
12168717
13275423
141039681
151697233
166406803
1710458821
1839480499
1964450159
20243289797
21397159775
221499219281
232447408809
249238605483
2515081612629
2656930852179
2792937084583
28350823718557
29572704120127

[3,5,19,31,117,191,721,1177,4443,7253,27379,44695,
 168717,275423,1039681,1697233,6406803,10458821,
 39480499,64450159,243289797,397159775,1499219281,
 2447408809,9238605483,15081612629,56930852179,
 92937084583,350823718557,572704120127]