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A153979 as a simple table

na(n)
15
27
37
413
511
619
711
811
911
1017
1111
1213
1331
1413
1513
1623
1713
1843
1917
2013
2113
2217
2319
2413
2519
2661
2723
2873
2917
3041
3123
3219
3347
3417
3519
3629
3719
38103
3929
4017
41109
4217
4319
4437
4517
4617
4771
4823
49139
5037
5119
5243
53151
5417
5583
5617
5723
5847
5943
6031
6119
62181
6317
6431
6547
6653
67193
6817
6923
70101
7123
72199
7329
7417

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