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A238137 as a simple table

na(n)
13
25
37
411
517
623
729
841
953
1083
11113
12173
13233
14293
15353
16593
17953
181553
192153
202753
215153
228753
2314753
2420753
2536353
2671153
27105953
28211313
29419873
30733793
311047713
322086673
334102193
348133233
3514179793
3626272913
3752439873
3890699953
39128960033
40167220113

[3,5,7,11,17,23,29,41,53,83,113,173,233,293,353,
 593,953,1553,2153,2753,5153,8753,14753,20753,
 36353,71153,105953,211313,419873,733793,1047713,
 2086673,4102193,8133233,14179793,26272913,
 52439873,90699953,128960033,167220113]