Numbers whose base-4 representation is the juxtaposition of two identical strings.

Terms

a(0) =5a(1) =10a(2) =15a(3) =68a(4) =85a(5) =102a(6) =119a(7) =136a(8) =153a(9) =170a(10) =187a(11) =204a(12) =221a(13) =238a(14) =255a(15) =1040a(16) =1105a(17) =1170a(18) =1235a(19) =1300a(20) =1365a(21) =1430a(22) =1495a(23) =1560a(24) =1625a(25) =1690a(26) =1755a(27) =1820a(28) =1885a(29) =1950