Numbers with exactly four distinct base-9 digits.

Terms

a(0) =750a(1) =751a(2) =752a(3) =753a(4) =754a(5) =755a(6) =758a(7) =760a(8) =761a(9) =762a(10) =763a(11) =764a(12) =767a(13) =768a(14) =770a(15) =771a(16) =772a(17) =773a(18) =776a(19) =777a(20) =778a(21) =780a(22) =781a(23) =782a(24) =785a(25) =786a(26) =787a(27) =788a(28) =790a(29) =791