%I A127423
%S A127423 1,21,32,43,54,65,76,87,98,109,1110,1211,1312,1413,1514,1615,1716,1817,
%T A127423 1918,2019,2120,2221,2322,2423,2524,2625,2726,2827,2928,3029,3130,3231,
%U A127423 3332,3433,3534,3635,3736,3837,3938,4039,4140,4241,4342,4443,4544,4645
%N A127423 a(1) = 1; for n>1, a(n) = n concatenated with n-1.
%C A127423 a(13)=1211 because 12 and 11 are two consecutive decreasing numbers
%p A127423 c2:=proc(x,y) local s: s:=proc(m) nops(convert(m,base,10)) end: x*10^s(y)+y: 
               end: seq(c2(n,n-1),n=1..53); - Emeric Deutsch (deutsch(AT)duke.poly.edu), 
               Mar 07 2007
%Y A127423 Cf. A127421-A127430.
%Y A127423 Sequence in context: A095994 A118866 A118535 this_sequence A035137 A075110 
               A036382
%Y A127423 Adjacent sequences: A127420 A127421 A127422 this_sequence A127424 A127425 
               A127426
%K A127423 nonn,base
%O A127423 1,2
%A A127423 Artur Jasinski (grafix(AT)csl.pl), Jan 14 2007
%E A127423 More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 07 2007