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A247229 as a simple table

na(n)
13
27
311
4127
589
68191
730839
8363889
9178481
102089
114404047
12616318177
13164511353
142099863
1513264529
1620394401

[3,7,11,127,89,8191,30839,363889,178481,2089,
 4404047,616318177,164511353,2099863,13264529,
 20394401]