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A218146 as a simple table

na(n)
11
27
313
419
531
637
743
855
961
1091
1197
12109
13121
14127
15139
16151
17163
18169
19217
20229
21241
22253
23265
24271
25283
26295
27307
28319
29331
30343
31355
32367
33379
34391
35397

[1,7,13,19,31,37,43,55,61,91,97,109,121,127,139,
 151,163,169,217,229,241,253,265,271,283,295,307,
 319,331,343,355,367,379,391,397]