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A107461 as a simple table

na(n)
11
21
33
41
53
67
73
81
99
1025
113
127
133
1425
15129
161
173
1831
193
20121
21729
2225
233
247
25123
2625
27729
285041
293
30151
313
321
33729
3425
355163
3640327
373
3825
39729
40121
413
425071
433
4440321
45363729
4625
473
487
495043
50145
51729
5240321
533
54362911
553628923
565041
57729
5825
593
6040447
613
6225

[1,1,3,1,3,7,3,1,9,25,3,7,3,25,129,1,3,31,3,121,
 729,25,3,7,123,25,729,5041,3,151,3,1,729,25,5163,
 40327,3,25,729,121,3,5071,3,40321,363729,25,3,7,
 5043,145,729,40321,3,362911,3628923,5041,729,25,3,
 40447,3,25]