Numbers which can be expressed as the product of numbers made of only fives.

Terms

a(0) =1a(1) =5a(2) =25a(3) =55a(4) =125a(5) =275a(6) =555a(7) =625a(8) =1375a(9) =2775a(10) =3025a(11) =3125a(12) =5555a(13) =6875a(14) =13875a(15) =15125a(16) =15625a(17) =27775a(18) =30525a(19) =34375a(20) =55555a(21) =69375a(22) =75625a(23) =78125a(24) =138875a(25) =152625a(26) =166375a(27) =171875a(28) =277775a(29) =305525