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%I #8 Aug 23 2021 21:45:02
%S 90,109,190,209,290,309,390,409,490,509,590,609,690,709,790,809,890,
%T 900,990,1009,1090,1109,1190,1209,1290,1309,1390,1409,1490,1509,1590,
%U 1609,1690,1709,1790,1809,1890,1900,1990,2009,2090
%N Numbers k such that 0 and 9 occur juxtaposed in the base-10 representation of k but not of k-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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