Largest prime < n^5.

Terms

a(0) =31a(1) =241a(2) =1021a(3) =3121a(4) =7759a(5) =16787a(6) =32749a(7) =59029a(8) =99991a(9) =161047a(10) =248827a(11) =371291a(12) =537811a(13) =759371a(14) =1048573a(15) =1419839a(16) =1889561a(17) =2476081a(18) =3199997a(19) =4084081a(20) =5153623a(21) =6436327a(22) =7962607a(23) =9765619a(24) =11881357a(25) =14348891a(26) =17210353a(27) =20511143a(28) =24299981