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A131580 as a simple table

na(n)
12
23
32
43
5163
619
7151
8263
9131
103041
11311
12401
132029
141163
152309
16157
17541
1861
19739
20563
211097
224813
231801
241399
25709
26317
2714563
28863
295479
30337
312351
329533
334931
34401
351117
3614639
3717791
381409
39571
405171
4116633
427001
432129
4410891
4531151
4622709
476079
48883
4920113

[2,3,2,3,163,19,151,263,131,3041,311,401,2029,
 1163,2309,157,541,61,739,563,1097,4813,1801,1399,
 709,317,14563,863,5479,337,2351,9533,4931,401,
 1117,14639,17791,1409,571,5171,16633,7001,2129,
 10891,31151,22709,6079,883,20113]