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A157971 as a simple table

na(n)
11
27
313
421
525
631
737
841
949
1055
1161
1269
1373
1481
1587
1693
1797
18103
19109
20117
21121
22127
23133
24137
25145
26151
27157
28161
29167
30173
31181
32185
33193
34199
35205
36213
37217
38223
39229
40233
41241
42247
43253
44261
45265
46273
47279
48285
49289
50295

[1,7,13,21,25,31,37,41,49,55,61,69,73,81,87,93,97,
 103,109,117,121,127,133,137,145,151,157,161,167,
 173,181,185,193,199,205,213,217,223,229,233,241,
 247,253,261,265,273,279,285,289,295]