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A229521 as a simple table

na(n)
13
27
37
417
533
617
739
8129
9129
1039
1191
12481
13775
14481
1591
16211
171751
184193
194193
201751
21211
22491
236433
2423059
2534151
2623059
276433
28491
291141
3023507
31124431
32275243
33275243
34124431
3523507
361141
372653
3886295
39680991
402223913
413336437
422223913
43680991

[3,7,7,17,33,17,39,129,129,39,91,481,775,481,91,
 211,1751,4193,4193,1751,211,491,6433,23059,34151,
 23059,6433,491,1141,23507,124431,275243,275243,
 124431,23507,1141,2653,86295,680991,2223913,
 3336437,2223913,680991]