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A198519 as a simple table

na(n)
13
25
311
419
57
637
717
861
923
10101
1113
12137
1329
14179
1531
16239
1741
18311
1967
20419
2171
22557
2373
24701
2547
26821
2743
28911
2959
301013
3179
321151
3353
341283
3597
361433
3783
381613
39127
401823
4189
422039
43109
442237
45113
462459
47139
482711
49103
502953
51107
523163
53163
543433
55131
563727
57149
584007
59181
604337
61173
624691

[3,5,11,19,7,37,17,61,23,101,13,137,29,179,31,239,
 41,311,67,419,71,557,73,701,47,821,43,911,59,1013,
 79,1151,53,1283,97,1433,83,1613,127,1823,89,2039,
 109,2237,113,2459,139,2711,103,2953,107,3163,163,
 3433,131,3727,149,4007,181,4337,173,4691]