Least number x such that x^n has n digits equal to k. Case k=5.

Terms

a(0) =5a(1) =75a(2) =136a(3) =273a(4) =435a(5) =725a(6) =715a(7) =1696a(8) =1205a(9) =2965a(10) =3705a(11) =1692a(12) =1953a(13) =4508a(14) =5915a(15) =10948a(16) =10124a(17) =13734a(18) =14696a(19) =20727a(20) =17653a(21) =22122a(22) =35855a(23) =24016a(24) =27643a(25) =33171a(26) =34153a(27) =64855a(28) =62667a(29) =81285