Numbers k such that 2 and 9 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =29a(1) =92a(2) =129a(3) =192a(4) =229a(5) =290a(6) =329a(7) =392a(8) =429a(9) =492a(10) =529a(11) =592a(12) =629a(13) =692a(14) =729a(15) =792a(16) =829a(17) =892a(18) =920a(19) =992a(20) =1029a(21) =1092a(22) =1129a(23) =1192a(24) =1229a(25) =1290a(26) =1329a(27) =1392a(28) =1429a(29) =1492