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A274910 as a simple table

na(n)
15
25
319
461
53221
637
745319
87321
91772893
1013421
111806113
121117
133158528101
141623931
15195019441
166304673
1750544702849929377
181772893
196115909044841454629
20212601841
2145319
221806113
233740221981231
2420113
251856458657451
263158528101
275559917315850179173

[5,5,19,61,3221,37,45319,7321,1772893,13421,
 1806113,1117,3158528101,1623931,195019441,6304673,
 50544702849929377,1772893,6115909044841454629,
 212601841,45319,1806113,3740221981231,20113,
 1856458657451,3158528101,5559917315850179173]