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A254935 as a simple table

na(n)
13
25
37
47
57
69
79
811
911
1011
1113
1215
1313
1413
1517
1615
1717
1819
1915
2017
2121
2217
2317
2421
2519
2623
2719
2819
2921
3023
3125
3221
3321
3427
3523
3629
3723
3823
3923
4023

[3,5,7,7,7,9,9,11,11,11,13,15,13,13,17,15,17,19,
 15,17,21,17,17,21,19,23,19,19,21,23,25,21,21,27,
 23,29,23,23,23,23]