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

Terms

a(0) =22015a(1) =22399a(2) =22495a(3) =22519a(4) =22525a(5) =23935a(6) =24031a(7) =24055a(8) =24061a(9) =24415a(10) =24439a(11) =24445a(12) =24535a(13) =24541a(14) =24565a(15) =30079a(16) =30175a(17) =30199a(18) =30205a(19) =30559a(20) =30583a(21) =30589a(22) =30679a(23) =30685a(24) =30709a(25) =32095a(26) =32119a(27) =32125a(28) =32215a(29) =32221