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A237054 as a simple table

na(n)
11
21
37
415
517
617
731
847
949
1049
1155
1279
1381
1481
15111
16111
17145
18177
19215
20255
21257
22257
23271
24319
25321
26321
27327
28383
29385
30385
31447
32511
33513
34513
35519
36527
37529
38529
39543
40623
41689
42753
43823
44847
45849
46849
47943
481007
491041
501137
511175
521279
531281
541281

[1,1,7,15,17,17,31,47,49,49,55,79,81,81,111,111,
 145,177,215,255,257,257,271,319,321,321,327,383,
 385,385,447,511,513,513,519,527,529,529,543,623,
 689,753,823,847,849,849,943,1007,1041,1137,1175,
 1279,1281,1281]