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A238048 as a simple table

na(n)
13
27
35
45
513
613
73
87
919
1019
117
1211
1311
1431
1523
165
1731
1813
1919
2037
2153
223
2313
2443
2523
2647
2743
2873
297
305
3119
3267
3329
3459
3579
3683
3711
3813
3911
4029
4173
4231
4361
4497
4589
463
4723
4843
4919
5059
51109
5241
5367
54103
55109
5613
5717
5829
5973
6023
6173
62157
6343
6471
65109
66149

[3,7,5,5,13,13,3,7,19,19,7,11,11,31,23,5,31,13,19,
 37,53,3,13,43,23,47,43,73,7,5,19,67,29,59,79,83,
 11,13,11,29,73,31,61,97,89,3,23,43,19,59,109,41,
 67,103,109,13,17,29,73,23,73,157,43,71,109,149]