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A032437 as a simple table

na(n)
13
27
313
417
537
673
797
8113
9137
10173
11197
12313
13317
14337
15373
16397
17773
18797
19937
20997
211373
221997
233137
243313
253373
263797
277937
289137
299173
309337
319397
3213313
3333797
3439397
3579337
3679397
3791373
3891997
3999137
4099173
4199397
42139397
43379397

[3,7,13,17,37,73,97,113,137,173,197,313,317,337,
 373,397,773,797,937,997,1373,1997,3137,3313,3373,
 3797,7937,9137,9173,9337,9397,13313,33797,39397,
 79337,79397,91373,91997,99137,99173,99397,139397,
 379397]