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A173928 as a simple table

na(n)
10
21
31
47
513
619
719
817
931
105
1147
1253
1347
1461
1541
1667
171
1831
1947
20113
21103
2279
23113
2427
2573
26149
27155
2857
29139
3021
3137
32161
33227
34211
35211
361
37337
38245
3941
40117
41413
42241
43337
4413
4579
46451
47421
4847
49181
50511
51311
52323
53423
54299
55545
56269
57565
58211

[0,1,1,7,13,19,19,17,31,5,47,53,47,61,41,67,1,31,
 47,113,103,79,113,27,73,149,155,57,139,21,37,161,
 227,211,211,1,337,245,41,117,413,241,337,13,79,
 451,421,47,181,511,311,323,423,299,545,269,565,
 211]