RF(5): refactorable numbers with smallest prime factor 5.

Terms

a(0) =625a(1) =1500625a(2) =9150625a(3) =17850625a(4) =37515625a(5) =52200625a(6) =73530625a(7) =81450625a(8) =174900625a(9) =442050625a(10) =577200625a(11) =1171350625a(12) =1766100625a(13) =1838265625a(14) =2136750625a(15) =3049800625a(16) =4931550625a(17) =7573350625a(18) =8653650625a(19) =12594450625a(20) =15882300625a(21) =17748900625a(22) =21970650625a(23) =24343800625