Numbers whose base-4 representation contains exactly four 1's and three 3's.

Terms

a(0) =5503a(1) =5599a(2) =5623a(3) =5629a(4) =5983a(5) =6007a(6) =6013a(7) =6103a(8) =6109a(9) =6133a(10) =7519a(11) =7543a(12) =7549a(13) =7639a(14) =7645a(15) =7669a(16) =8023a(17) =8029a(18) =8053a(19) =8149a(20) =13663a(21) =13687a(22) =13693a(23) =13783a(24) =13789a(25) =13813a(26) =14167a(27) =14173a(28) =14197a(29) =14293