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A125766 as a simple table

na(n)
12
23
35
42
55
67
73
817
97
1011
1129
125
1319
1411
1529
165
1731
1811
1929
2013
2137
2241
237
24139
2513
2631
2719
2867
297
3043
3117
32179
3323
3483
3529
3679
3753
3823
3971
4019
41181
4241
43107
4431
45137
4611
4789
4847
49197
5037
51331
5259
53109
5441
55191
5667
5729
58251
5979
60251
6159
62389
6361
64197
6543
66211
6711
68109
6931

[2,3,5,2,5,7,3,17,7,11,29,5,19,11,29,5,31,11,29,
 13,37,41,7,139,13,31,19,67,7,43,17,179,23,83,29,
 79,53,23,71,19,181,41,107,31,137,11,89,47,197,37,
 331,59,109,41,191,67,29,251,79,251,59,389,61,197,
 43,211,11,109,31]