Numbers which have only digits 8 and 9 in base 10.

Terms

a(0) =8a(1) =9a(2) =88a(3) =89a(4) =98a(5) =99a(6) =888a(7) =889a(8) =898a(9) =899a(10) =988a(11) =989a(12) =998a(13) =999a(14) =8888a(15) =8889a(16) =8898a(17) =8899a(18) =8988a(19) =8989a(20) =8998a(21) =8999a(22) =9888a(23) =9889a(24) =9898a(25) =9899a(26) =9988a(27) =9989a(28) =9998a(29) =9999