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A218695 as a simple table

na(n)
11
21
31
41
57
61
71
825
925
101
111
1279
13265
1479
151
161
17241
182161
192161
20241
211
221
23727
2416081
2541503
2616081
27727
281
291
302185
31115465
32693601
33693601
34115465
352185
361
371
386559
39816985
4010924399
4124997921
4210924399
43816985
446559
451

[1,1,1,1,7,1,1,25,25,1,1,79,265,79,1,1,241,2161,
 2161,241,1,1,727,16081,41503,16081,727,1,1,2185,
 115465,693601,693601,115465,2185,1,1,6559,816985,
 10924399,24997921,10924399,816985,6559,1]