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A236568 as a simple table

na(n)
13
25
311
431
541
643
747
867
979
10107
11199
12223
13251
14263
15311
16313
17461
18467
19499
20577
21599
22641
23727
24743
25797
26911
27919
28929
291163
301187
311277
321303
331429
341433
351447
361613
371619
381621
391637
401783
411789
421823
431831
441867
451879
461997
472029
482039
492089
502309

[3,5,11,31,41,43,47,67,79,107,199,223,251,263,311,
 313,461,467,499,577,599,641,727,743,797,911,919,
 929,1163,1187,1277,1303,1429,1433,1447,1613,1619,
 1621,1637,1783,1789,1823,1831,1867,1879,1997,2029,
 2039,2089,2309]