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A140564 as a simple table

na(n)
15
27
317
419
517
619
729
831
929
1031
1141
1243
1359
1461
1571
1673
17137
18139
19149
20151
21179
22181
23191
24193
25227
26229
27239
28241
29269
30271
31281
32283
33419
34421
35431
36433
37809
38811
39821
40823
411019
421021
431031
441033
451049
461051
471061
481063
491277
501279
511289
521291
531289

[5,7,17,19,17,19,29,31,29,31,41,43,59,61,71,73,
 137,139,149,151,179,181,191,193,227,229,239,241,
 269,271,281,283,419,421,431,433,809,811,821,823,
 1019,1021,1031,1033,1049,1051,1061,1063,1277,1279,
 1289,1291,1289]