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A291164 as a simple table

na(n)
11
25
325
4125
5625
63125
74097
87361
915625
1069649
1178125
1285073
13125137
14390625
15658529
16987377
171184033
181953125
192127329
202358529
213187313
223999137
239765625
2411194993
2516777217
2616785409
2720128561
2820502593
2930030769
3036164593
3140094993
3248828125
3350281793

[1,5,25,125,625,3125,4097,7361,15625,69649,78125,
 85073,125137,390625,658529,987377,1184033,1953125,
 2127329,2358529,3187313,3999137,9765625,11194993,
 16777217,16785409,20128561,20502593,30030769,
 36164593,40094993,48828125,50281793]