Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.

Terms

a(0) =0a(1) =1a(2) =4a(3) =81a(4) =84a(5) =85a(6) =256a(7) =273a(8) =324a(9) =325a(10) =336a(11) =337a(12) =1089a(13) =1092a(14) =1093a(15) =20496a(16) =20497a(17) =20736a(18) =20737a(19) =20740a(20) =65620a(21) =65856a(22) =65857a(23) =81921a(24) =81984a(25) =81985a(26) =82000a(27) =86032a(28) =86277a(29) =86292