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A249806 as a simple table

na(n)
13
23
37
43
53
69
77
851
913
107
1115
1221
1315
143
1531
16147
1745
1869
1943
2073
2115
2269
2391
2419
2551
2681
273
2825
299
3085
31103
3255
33169
34225
35109
36145
3715
38103
39615
4069
41259
4269
4363
4445
45285
46471
479
48255
49169
50489
5169
52273
53427
5443
55391
56169
57201
5821

[3,3,7,3,3,9,7,51,13,7,15,21,15,3,31,147,45,69,43,
 73,15,69,91,19,51,81,3,25,9,85,103,55,169,225,109,
 145,15,103,615,69,259,69,63,45,285,471,9,255,169,
 489,69,273,427,43,391,169,201,21]