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A099988 as a simple table

na(n)
11
27
313
421
531
637
749
863
969
1075
1187
1299
13111
14127
15133
16141
17159
18169
19189
20195
21205
22219
23231
24237
25259
26267
27283
28289
29303
30319
31327
32339
33357
34367
35391
36399
37415
38427
39433
40463
41477
42487
43495
44517
45529
46537
47553
48577
49583
50601
51615
52621
53639
54645
55655

[1,7,13,21,31,37,49,63,69,75,87,99,111,127,133,
 141,159,169,189,195,205,219,231,237,259,267,283,
 289,303,319,327,339,357,367,391,399,415,427,433,
 463,477,487,495,517,529,537,553,577,583,601,615,
 621,639,645,655]