RF(3): refactorable numbers with smallest prime factor 3.

Terms

a(0) =9a(1) =225a(2) =441a(3) =1089a(4) =1521a(5) =2025a(6) =2601a(7) =3249a(8) =4761a(9) =5625a(10) =6561a(11) =7569a(12) =8649a(13) =12321a(14) =15129a(15) =16641a(16) =19881a(17) =25281a(18) =31329a(19) =33489a(20) =35721a(21) =40401a(22) =45369a(23) =47961a(24) =50625a(25) =56169a(26) =62001a(27) =71289a(28) =84681a(29) =91809