Numbers consisting of ones and eights.

Terms

a(0) =1a(1) =8a(2) =11a(3) =18a(4) =81a(5) =88a(6) =111a(7) =118a(8) =181a(9) =188a(10) =811a(11) =818a(12) =881a(13) =888a(14) =1111a(15) =1118a(16) =1181a(17) =1188a(18) =1811a(19) =1818a(20) =1881a(21) =1888a(22) =8111a(23) =8118a(24) =8181a(25) =8188a(26) =8811a(27) =8818a(28) =8881a(29) =8888