Numbers whose base-7 representation has the same nonzero number of 2's and 6's.

Terms

a(0) =20a(1) =44a(2) =69a(3) =93a(4) =104a(5) =111a(6) =125a(7) =132a(8) =139a(9) =140a(10) =141a(11) =143a(12) =144a(13) =145a(14) =167a(15) =191a(16) =216a(17) =240a(18) =265a(19) =289a(20) =296a(21) =303a(22) =308a(23) =309a(24) =311a(25) =312a(26) =313a(27) =317a(28) =324a(29) =331