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A103798 as a simple table

na(n)
13
27
311
427
531
647
751
867
9107
10123
11135
12151
13159
14163
15175
16211
17251
18259
19279
20295
21479
22527
23539
24607
25619
26631
27771
28783
29847
30999
311035
321051
331071
341183
351279
361295
371299
381323
391375
401399
411411
421439
431451
441479
451571
461691
471715
481759
491787
501991

[3,7,11,27,31,47,51,67,107,123,135,151,159,163,
 175,211,251,259,279,295,479,527,539,607,619,631,
 771,783,847,999,1035,1051,1071,1183,1279,1295,
 1299,1323,1375,1399,1411,1439,1451,1479,1571,1691,
 1715,1759,1787,1991]