Numbers having four 1's in base 9.

Terms

a(0) =820a(1) =6652a(2) =7300a(3) =7372a(4) =7380a(5) =7382a(6) =7383a(7) =7384a(8) =7385a(9) =7386a(10) =7387a(11) =7388a(12) =7390a(13) =7399a(14) =7408a(15) =7417a(16) =7426a(17) =7435a(18) =7444a(19) =7462a(20) =7543a(21) =7624a(22) =7705a(23) =7786a(24) =7867a(25) =7948a(26) =8110a(27) =8839a(28) =9568a(29) =10297