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A068228 as a simple table

na(n)
113
237
361
473
597
6109
7157
8181
9193
10229
11241
12277
13313
14337
15349
16373
17397
18409
19421
20433
21457
22541
23577
24601
25613
26661
27673
28709
29733
30757
31769
32829
33853
34877
35937
36997
371009
381021
391033
401069
411093
421117
431129
441153
451201
461213
471237
481249
491297

[13,37,61,73,97,109,157,181,193,229,241,277,313,
 337,349,373,397,409,421,433,457,541,577,601,613,
 661,673,709,733,757,769,829,853,877,937,997,1009,
 1021,1033,1069,1093,1117,1129,1153,1201,1213,1237,
 1249,1297]