Numbers with exactly four distinct base-7 digits.

Terms

a(0) =360a(1) =361a(2) =362a(3) =363a(4) =366a(5) =368a(6) =369a(7) =370a(8) =373a(9) =374a(10) =376a(11) =377a(12) =380a(13) =381a(14) =382a(15) =384a(16) =387a(17) =388a(18) =389a(19) =390a(20) =444a(21) =445a(22) =446a(23) =447a(24) =462a(25) =466a(26) =467a(27) =468a(28) =469a(29) =472