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A256397 as a simple table

na(n)
117
223
341
447
571
689
7113
8137
9167
10191
11233
12239
13257
14263
15281
16311
17353
18359
19383
20401
21431
22449
23479
24503
25521
26569
27593
28599
29617
30641
31647
32719
33743
34761
35809
36839
37857
38863
39881
40887
41911
42929
43953
44977
45983
461031
471049
481097
491103
501151
511193

[17,23,41,47,71,89,113,137,167,191,233,239,257,
 263,281,311,353,359,383,401,431,449,479,503,521,
 569,593,599,617,641,647,719,743,761,809,839,857,
 863,881,887,911,929,953,977,983,1031,1049,1097,
 1103,1151,1193]