Numbers whose base-6 representation has the same nonzero number of 1's and 5's.

Terms

a(0) =11a(1) =31a(2) =41a(3) =53a(4) =59a(5) =65a(6) =66a(7) =68a(8) =69a(9) =70a(10) =83a(11) =103a(12) =119a(13) =139a(14) =155a(15) =175a(16) =181a(17) =186a(18) =188a(19) =189a(20) =190a(21) =193a(22) =199a(23) =205a(24) =221a(25) =233a(26) =239a(27) =245a(28) =246a(29) =248