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A087821 as a simple table

na(n)
03
15
25
37
47
511
613
713
813
917
1017
1123
1229
1331
1431
1543
1643
1747
1853
1953
2061
2173
2283
2389
2489
25103
26131
27131
28173
29223
30227
31241
32251
33257
34311
35331
36359
37443
38523

[3,5,5,7,7,11,13,13,13,17,17,23,29,31,31,43,43,47,
 53,53,61,73,83,89,89,103,131,131,173,223,227,241,
 251,257,311,331,359,443,523]