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A254760 as a simple table

na(n)
15
27
39
411
513
611
713
815
919
1021
1117
1217
1321
1425
1519
1623
1721
1821
1929
2023
2123
2231
2333
2425
2527
2625
2729
2831
2931
3029
3129
3237
3341
3431
3535
3631
3737
3839
3941
4043
4135
4239
4335
4435
4543
4635
4749
4841
4937

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