Numbers whose set of base-5 digits is {1,2}.

Terms

a(0) =1a(1) =2a(2) =6a(3) =7a(4) =11a(5) =12a(6) =31a(7) =32a(8) =36a(9) =37a(10) =56a(11) =57a(12) =61a(13) =62a(14) =156a(15) =157a(16) =161a(17) =162a(18) =181a(19) =182a(20) =186a(21) =187a(22) =281a(23) =282a(24) =286a(25) =287a(26) =306a(27) =307a(28) =311a(29) =312