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A114521 as a simple table

na(n)
15
27
37
411
513
611
711
819
913
1013
1119
1217
1329
1431
1517
1623
1743
1819
1929
2031
2123
2261
2373
2441
2537
2683
2719
2847
2931
3067
3153
32103
3329
3417
35109
3637
37127
3871
3923
40139
4141
42151
4383
4431
4543
46181
47193
48131
4923
50101
5123
52199
5329
5441
55107
5619
5761
5843
5937
60113
6171
62229
6323
6467
65241

[5,7,7,11,13,11,11,19,13,13,19,17,29,31,17,23,43,
 19,29,31,23,61,73,41,37,83,19,47,31,67,53,103,29,
 17,109,37,127,71,23,139,41,151,83,31,43,181,193,
 131,23,101,23,199,29,41,107,19,61,43,37,113,71,
 229,23,67,241]