Numbers of the form (9^{mr}-1)/(9^r-1) for positive integers m, r.

Terms

a(0) =1a(1) =10a(2) =82a(3) =91a(4) =730a(5) =820a(6) =6562a(7) =6643a(8) =7381a(9) =59050a(10) =66430a(11) =531442a(12) =532171a(13) =538084a(14) =597871a(15) =4782970a(16) =5380840a(17) =43046722a(18) =43053283a(19) =43584805a(20) =48427561a(21) =387420490a(22) =387952660a(23) =435848050a(24) =3486784402a(25) =3486843451a(26) =3530369206a(27) =3922632451a(28) =31381059610a(29) =35303692060