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A156770 as a simple table

na(n)
11
23
37
49
511
617
721
829
939
1043
1149
1251
1353
1481
1591
1699
17103
18123
19127
20133
21153
22191
23227
24231
25241
26249
27253
28273
29281
30291
31293
32311
33323
34333
35337
36339
37341
38347
39359
40377
41387
42397
43427
44429
45431
46441
47443
48453
49461
50467
51471
52481
53489
54493
55523
56541

[1,3,7,9,11,17,21,29,39,43,49,51,53,81,91,99,103,
 123,127,133,153,191,227,231,241,249,253,273,281,
 291,293,311,323,333,337,339,341,347,359,377,387,
 397,427,429,431,441,443,453,461,467,471,481,489,
 493,523,541]