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A273330 as a simple table

na(n)
01
15
29
317
421
529
637
769
873
981
1089
11121
12129
13161
14185
15281
16285
17293
18301
19333
20341
21373
22397
23493
24505
25529
26553
27649
28673
29769
30841
311129
321133
331141
341149
351181
361189
371221
381245
391341
401353
411377
421401
431497
441521
451617
461689
471977
481989
492013

[1,5,9,17,21,29,37,69,73,81,89,121,129,161,185,
 281,285,293,301,333,341,373,397,493,505,529,553,
 649,673,769,841,1129,1133,1141,1149,1181,1189,
 1221,1245,1341,1353,1377,1401,1497,1521,1617,1689,
 1977,1989,2013]