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A254930 as a simple table

na(n)
15
27
311
49
513
617
713
819
923
1017
1115
1221
1325
1417
1523
1627
1735
1823
1929
2021
2141
2225
2331
2423
2535
2629
2739
2843
2937
3031
3127
3249
3353
3433
3531
3637
3747
3841
3955
4059
4131
4245
4339
4449
4537
4635
4761
4837
4935

[5,7,11,9,13,17,13,19,23,17,15,21,25,17,23,27,35,
 23,29,21,41,25,31,23,35,29,39,43,37,31,27,49,53,
 33,31,37,47,41,55,59,31,45,39,49,37,35,61,37,35]