Numbers k with digits 5 and 8 only.

Terms

a(0) =5a(1) =8a(2) =55a(3) =58a(4) =85a(5) =88a(6) =555a(7) =558a(8) =585a(9) =588a(10) =855a(11) =858a(12) =885a(13) =888a(14) =5555a(15) =5558a(16) =5585a(17) =5588a(18) =5855a(19) =5858a(20) =5885a(21) =5888a(22) =8555a(23) =8558a(24) =8585a(25) =8588a(26) =8855a(27) =8858a(28) =8885a(29) =8888