Triangular numbers composed of digits {0,1,8}.

Terms

a(0) =1a(1) =10a(2) =1081a(3) =8001a(4) =10011a(5) =81810a(6) =108811a(7) =1188111a(8) =8018010a(9) =8801110a(10) =10888111a(11) =80118811a(12) =88000011a(13) =800180010a(14) =881811010a(15) =1088881111a(16) =10808101800a(17) =80001800010a(18) =81108010180a(19) =108888811111a(20) =810008010801a(21) =880818181011a(22) =888000000111