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A031387 as a simple table

na(n)
15
223
347
473
5103
6137
7167
8197
9233
10269
11307
12347
13379
14419
15449
16487
17523
18571
19607
20643
21677
22727
23761
24811
25853
26883
27937
28977
291019
301051
311093
321129
331187
341229
351279
361303
371367
381427
391453
401489
411543
421579
431613
441663
451709
461753

[5,23,47,73,103,137,167,197,233,269,307,347,379,
 419,449,487,523,571,607,643,677,727,761,811,853,
 883,937,977,1019,1051,1093,1129,1187,1229,1279,
 1303,1367,1427,1453,1489,1543,1579,1613,1663,1709,
 1753]