Numbers whose prime factors are 3 and 5.

Terms

a(0) =15a(1) =45a(2) =75a(3) =135a(4) =225a(5) =375a(6) =405a(7) =675a(8) =1125a(9) =1215a(10) =1875a(11) =2025a(12) =3375a(13) =3645a(14) =5625a(15) =6075a(16) =9375a(17) =10125a(18) =10935a(19) =16875a(20) =18225a(21) =28125a(22) =30375a(23) =32805a(24) =46875a(25) =50625a(26) =54675a(27) =84375a(28) =91125a(29) =98415