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A321784 as a simple table

na(n)
13
25
37
45
57
611
79
813
917
1011
1111
1213
137
149
1515
1613
1721
1827
1917
2019
2123
2213
2319
2429
2523
2631
2741
2827
2925
3029
3115
3217
3325
3419
3523
3631
3721
3817
3919
409
4111
4219
4317
4429
4537
4623
4727
4833
4919
5031
5147
5237
5349
5465
5543
5639
5745
5823
5929
6043
6133
6241
6355
6437
6531
6635
6717

[3,5,7,5,7,11,9,13,17,11,11,13,7,9,15,13,21,27,17,
 19,23,13,19,29,23,31,41,27,25,29,15,17,25,19,23,
 31,21,17,19,9,11,19,17,29,37,23,27,33,19,31,47,37,
 49,65,43,39,45,23,29,43,33,41,55,37,31,35,17]