Position of n-th 9 in A007376.

Terms

a(0) =9a(1) =29a(2) =49a(3) =69a(4) =89a(5) =109a(6) =129a(7) =149a(8) =169a(9) =170a(10) =172a(11) =174a(12) =176a(13) =178a(14) =180a(15) =182a(16) =184a(17) =186a(18) =188a(19) =189a(20) =219a(21) =249a(22) =279a(23) =309a(24) =339a(25) =369a(26) =399a(27) =429a(28) =459a(29) =461