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A118718 as a simple table

na(n)
13
27
325
433
537
673
775
8223
9235
10237
11273
12327
13357
14535
15537
16553
17577
18723
19727
20735
21777
222253
232257
242277
252323
262335
272355
282523
292527
302557
312575
322725
332755
342773
353223
363235
373325
383355
393727
403753
415233
425235
435253
445277
455325

[3,7,25,33,37,73,75,223,235,237,273,327,357,535,
 537,553,577,723,727,735,777,2253,2257,2277,2323,
 2335,2355,2523,2527,2557,2575,2725,2755,2773,3223,
 3235,3325,3355,3727,3753,5233,5235,5253,5277,5325]