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A172480 as a simple table

na(n)
15
27
313
417
529
631
737
841
943
1053
1161
1267
1373
1489
1597
16101
17109
18113
19137
20149
21157
22173
23181
24193
25197
26229
27233
28241
29257
30269
31277
32281
33293
34307
35313
36317
37337
38349
39353
40367
41373
42389
43397
44401
45409
46421
47433
48449
49457
50461
51487
52509
53521
54541
55557
56569

[5,7,13,17,29,31,37,41,43,53,61,67,73,89,97,101,
 109,113,137,149,157,173,181,193,197,229,233,241,
 257,269,277,281,293,307,313,317,337,349,353,367,
 373,389,397,401,409,421,433,449,457,461,487,509,
 521,541,557,569]