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A280878 as a simple table

na(n)
121
233
363
499
5147
6189
7231
8273
9297
10357
11363
12399
13429
14441
15483
16561
17567
18609
19627
20651
21663
22693
23741
24759
25777
26819
27861
28891
29897
30903
31957
32969
33987
341023
351029
361071
371089
381113
391131
401173
411197
421209
431221
441239
451281
461287
471311
481323
491353
501407
511419
521443
531449

[21,33,63,99,147,189,231,273,297,357,363,399,429,
 441,483,561,567,609,627,651,663,693,741,759,777,
 819,861,891,897,903,957,969,987,1023,1029,1071,
 1089,1113,1131,1173,1197,1209,1221,1239,1281,1287,
 1311,1323,1353,1407,1419,1443,1449]