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A172280 as a simple table

na(n)
117
241
373
489
597
6113
7137
8193
9233
10241
11251
12257
13281
14307
15313
16337
17353
18401
19409
20433
21439
22449
23457
24499
25521
26569
27577
28593
29601
30617
31641
32643
33673
34727
35761
36769
37809
38857
39881
40919
41929
42937
43953
44977
45997
461009
471013
481033
491049
501097
511129
521153

[17,41,73,89,97,113,137,193,233,241,251,257,281,
 307,313,337,353,401,409,433,439,449,457,499,521,
 569,577,593,601,617,641,643,673,727,761,769,809,
 857,881,919,929,937,953,977,997,1009,1013,1033,
 1049,1097,1129,1153]