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A283145 as a simple table

na(n)
15
27
317
423
531
641
753
867
971
1089
11127
12149
13173
14199
15251
16281
17283
18347
19383
20409
21461
22479
23523
24593
25641
26691
27719
28773
29823
30887
31971
321033
331097
341163
351231
361301
371373
381447
391619
401709
411741
421823
431907

[5,7,17,23,31,41,53,67,71,89,127,149,173,199,251,
 281,283,347,383,409,461,479,523,593,641,691,719,
 773,823,887,971,1033,1097,1163,1231,1301,1373,
 1447,1619,1709,1741,1823,1907]