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A168269 as a simple table

na(n)
13
23
37
47
511
611
715
815
919
1019
1123
1223
1327
1427
1531
1631
1735
1835
1939
2039
2143
2243
2347
2447
2551
2651
2755
2855
2959
3059
3163
3263
3367
3467
3571
3671
3775
3875
3979
4079
4183
4283
4387
4487
4591
4691
4795
4895
4999
5099
51103
52103
53107
54107
55111
56111
57115
58115
59119
60119
61123
62123
63127
64127
65131
66131

[3,3,7,7,11,11,15,15,19,19,23,23,27,27,31,31,35,
 35,39,39,43,43,47,47,51,51,55,55,59,59,63,63,67,
 67,71,71,75,75,79,79,83,83,87,87,91,91,95,95,99,
 99,103,103,107,107,111,111,115,115,119,119,123,
 123,127,127,131,131]