Numbers having three 7's in base 9.

Terms

a(0) =637a(1) =1366a(2) =2095a(3) =2824a(4) =3553a(5) =4282a(6) =5011a(7) =5173a(8) =5254a(9) =5335a(10) =5416a(11) =5497a(12) =5578a(13) =5659a(14) =5677a(15) =5686a(16) =5695a(17) =5704a(18) =5713a(19) =5722a(20) =5731a(21) =5733a(22) =5734a(23) =5735a(24) =5736a(25) =5737a(26) =5738a(27) =5739a(28) =5741a(29) =5749