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A249801 as a simple table

na(n)
15
27
313
413
531
619
729
897
937
1031
1167
1237
1353
1443
1561
1697
17103
1873
19229
2061
21127
2267
23139
2473
25101
2679
27109
28113
29233
30181
31373
3297
33199
34103
35211
36109
37149
38229
39157
40241
41739
42127
43173
44353
45181
46139
47283
48193
49197
50151
51307
52157
53743
54163
55331
56337
57229

[5,7,13,13,31,19,29,97,37,31,67,37,53,43,61,97,
 103,73,229,61,127,67,139,73,101,79,109,113,233,
 181,373,97,199,103,211,109,149,229,157,241,739,
 127,173,353,181,139,283,193,197,151,307,157,743,
 163,331,337,229]