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A118940 as a simple table

na(n)
13
27
317
423
541
647
771
889
9103
10113
11127
12137
13151
14191
15193
16199
17223
18263
19271
20281
21337
22359
23401
24439
25457
26503
27521
28569
29577
30599
31641
32719
33727
34751
35839
36857
37863
38881
39887
40929
41991
421009
431033
441097
451103
461151
471193
481217
491231
501279
511297
521303

[3,7,17,23,41,47,71,89,103,113,127,137,151,191,
 193,199,223,263,271,281,337,359,401,439,457,503,
 521,569,577,599,641,719,727,751,839,857,863,881,
 887,929,991,1009,1033,1097,1103,1151,1193,1217,
 1231,1279,1297,1303]