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

Terms

a(0) =1535a(1) =1919a(2) =2015a(3) =2039a(4) =2045a(5) =3455a(6) =3551a(7) =3575a(8) =3581a(9) =3935a(10) =3959a(11) =3965a(12) =4055a(13) =4061a(14) =4085a(15) =4607a(16) =4991a(17) =5087a(18) =5111a(19) =5117a(20) =5375a(21) =5887a(22) =5951a(23) =6079a(24) =6095a(25) =6127a(26) =6131a(27) =6139a(28) =6140a(29) =6142