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A254938 as a simple table

na(n)
11
23
31
45
51
67
75
81
97
1011
113
121
1313
147
155
1611
179
1817
195
203
219
2219
237
2413
255
263
277
2819
2913
301
319
3225
3315
347
3523
3627
3717
389
3921
407
411
4213
4319
4411
4523
4617
4731
487
491
5033
5111
5217
537
5427
555
5635
5713
5825
5919
6011
6129
629
6317
645
653
661
6727
6821
6935
7017
7123
7215
7337

[1,3,1,5,1,7,5,1,7,11,3,1,13,7,5,11,9,17,5,3,9,19,
 7,13,5,3,7,19,13,1,9,25,15,7,23,27,17,9,21,7,1,13,
 19,11,23,17,31,7,1,33,11,17,7,27,5,35,13,25,19,11,
 29,9,17,5,3,1,27,21,35,17,23,15,37]