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A068828 as a simple table

na(n)
12
23
37
413
519
623
731
843
947
1061
1173
1283
1389
14103
15109
16113
17131
18139
19151
20167
21181
22193
23199
24229
25233
26241
27271
28283
29293
30313
31317
32337
33349
34353
35359
36383
37389
38401
39409
40421
41433
42443
43449
44463
45467
46491
47503
48509
49523
50547
51571
52577
53601
54619
55643

[2,3,7,13,19,23,31,43,47,61,73,83,89,103,109,113,
 131,139,151,167,181,193,199,229,233,241,271,283,
 293,313,317,337,349,353,359,383,389,401,409,421,
 433,443,449,463,467,491,503,509,523,547,571,577,
 601,619,643]