Numbers whose base-9 representation has the same nonzero number of 2's and 7's.

Terms

a(0) =25a(1) =65a(2) =106a(3) =146a(4) =169a(5) =178a(6) =196a(7) =205a(8) =214a(9) =223a(10) =225a(11) =226a(12) =228a(13) =229a(14) =230a(15) =231a(16) =233a(17) =241a(18) =268a(19) =308a(20) =349a(21) =389a(22) =430a(23) =470a(24) =511a(25) =551a(26) =569a(27) =578a(28) =585a(29) =586