Numbers whose base-9 representation has the same nonzero number of 7's and 8's.

Terms

a(0) =71a(1) =79a(2) =152a(3) =160a(4) =233a(5) =241a(6) =314a(7) =322a(8) =395a(9) =403a(10) =476a(11) =484a(12) =557a(13) =565a(14) =575a(15) =584a(16) =593a(17) =602a(18) =611a(19) =620a(20) =629a(21) =639a(22) =640a(23) =641a(24) =642a(25) =643a(26) =644a(27) =645a(28) =655a(29) =664