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A066983 as a simple table

na(n)
11
21
31
43
53
67
79
817
925
1043
1167
12111
13177
14289
15465
16755
171219
181975
193193
205169
218361
2213531
2321891
2435423
2557313
2692737
27150049
28242787
29392835
30635623
311028457
321664081
332692537
344356619
357049155
3611405775
3718454929
3829860705
3948315633
4078176339

[1,1,1,3,3,7,9,17,25,43,67,111,177,289,465,755,
 1219,1975,3193,5169,8361,13531,21891,35423,57313,
 92737,150049,242787,392835,635623,1028457,1664081,
 2692537,4356619,7049155,11405775,18454929,
 29860705,48315633,78176339]