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A137440 as a simple table

na(n)
12
23
37
45
517
667
77
829
9107
10421
1111
1241
13157
14599
152153
1613
1753
18199
19769
202791
219857
2217
2367
24257
25967
263469
2712203
2841851
2919
3079
31311
321151
334129
3414537
3549697
36167623
3723
3897
39367
401327
414817
4216871
4357571
44193957
45645581
4629
47107
48421
491549
505521

[2,3,7,5,17,67,7,29,107,421,11,41,157,599,2153,13,
 53,199,769,2791,9857,17,67,257,967,3469,12203,
 41851,19,79,311,1151,4129,14537,49697,167623,23,
 97,367,1327,4817,16871,57571,193957,645581,29,107,
 421,1549,5521]