Numbers whose base-10 representation has the same nonzero number of 1's and 8's.

Terms

a(0) =18a(1) =81a(2) =108a(3) =128a(4) =138a(5) =148a(6) =158a(7) =168a(8) =178a(9) =180a(10) =182a(11) =183a(12) =184a(13) =185a(14) =186a(15) =187a(16) =189a(17) =198a(18) =218a(19) =281a(20) =318a(21) =381a(22) =418a(23) =481a(24) =518a(25) =581a(26) =618a(27) =681a(28) =718a(29) =781