Numbers n with property that n is a substring of its base 4 representation.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =3320a(5) =3321a(6) =3322a(7) =3323a(8) =112000a(9) =112001a(10) =112002a(11) =112003a(12) =121322a(13) =121330a(14) =211320a(15) =211321a(16) =211322a(17) =211323a(18) =320232a(19) =320302a(20) =321230a(21) =321301a(22) =322222a(23) =323221a(24) =323320a(25) =323321a(26) =323322a(27) =323323a(28) =10030333a(29) =20332101