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A309726 as a simple table

na(n)
15
27
311
413
517
619
725
829
935
1041
1149
1253
1359
1461
1579
1685
1791
1895
1997
20103
21107
22113
23119
24121
25137
26139
27145
28149
29163
30169
31173
32179
33181
34185
35191
36205
37209
38227
39233
40235
41245
42251

[5,7,11,13,17,19,25,29,35,41,49,53,59,61,79,85,91,
 95,97,103,107,113,119,121,137,139,145,149,163,169,
 173,179,181,185,191,205,209,227,233,235,245,251]