Numbers whose base-9 representation has the same nonzero number of 1's and 7's.

Terms

a(0) =16a(1) =64a(2) =88a(3) =106a(4) =115a(5) =124a(6) =133a(7) =142a(8) =144a(9) =146a(10) =147a(11) =148a(12) =149a(13) =150a(14) =152a(15) =160a(16) =178a(17) =226a(18) =259a(19) =307a(20) =340a(21) =388a(22) =421a(23) =469a(24) =502a(25) =550a(26) =568a(27) =576a(28) =578a(29) =579