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A253973 as a simple table

na(n)
17
217
343
471
579
697
7107
8139
9179
10197
11223
12269
13277
14283
15313
16317
17337
18349
19401
20409
21431
22439
23457
24491
25521
26673
27743
28761
29787
30809
31827
32839
33853
34881
35907
361021
371039
381061
391087
401151
411193
421213
431277
441303
451373
461399
471429
481447
491471
501483

[7,17,43,71,79,97,107,139,179,197,223,269,277,283,
 313,317,337,349,401,409,431,439,457,491,521,673,
 743,761,787,809,827,839,853,881,907,1021,1039,
 1061,1087,1151,1193,1213,1277,1303,1373,1399,1429,
 1447,1471,1483]