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A068145 as a simple table

na(n)
12
25
331
4257
5283
6823547
7823799
810000823543
911112006825558043
10437893890380859631
1139346408075296538398967
1220880467999847912043271133358823
1388817841970012523233890533447265881

[2,5,31,257,283,823547,823799,10000823543,
 11112006825558043,437893890380859631,
 39346408075296538398967,
 20880467999847912043271133358823,
 88817841970012523233890533447265881]