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A006512 as a simple table

na(n)
15
27
313
419
531
643
761
873
9103
10109
11139
12151
13181
14193
15199
16229
17241
18271
19283
20313
21349
22421
23433
24463
25523
26571
27601
28619
29643
30661
31811
32823
33829
34859
35883
361021
371033
381051
391063
401093
411153
421231
431279
441291
451303
461321
471429
481453
491483
501489
511609

[5,7,13,19,31,43,61,73,103,109,139,151,181,193,
 199,229,241,271,283,313,349,421,433,463,523,571,
 601,619,643,661,811,823,829,859,883,1021,1033,
 1051,1063,1093,1153,1231,1279,1291,1303,1321,1429,
 1453,1483,1489,1609]