Numbers whose base-10 representation has the same nonzero number of 2's and 6's.

Terms

a(0) =26a(1) =62a(2) =126a(3) =162a(4) =206a(5) =216a(6) =236a(7) =246a(8) =256a(9) =260a(10) =261a(11) =263a(12) =264a(13) =265a(14) =267a(15) =268a(16) =269a(17) =276a(18) =286a(19) =296a(20) =326a(21) =362a(22) =426a(23) =462a(24) =526a(25) =562a(26) =602a(27) =612a(28) =620a(29) =621