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%I #6 Nov 22 2017 01:15:07
%S 2,11,212,2121,21211,121121,2212212,22122121,221221211,2212212112,
%T 22122121122,112212211211,1122122112112,11221221121121,
%U 112212211211212,1122122112112122,11211212212211211,112212211211212211,1211212212112212212,12112122121122122121,121121221211221221211
%N Last block of length-n to appear for the first time in the Kolakoski sequence K (A000002).
%e For n = 4 the last block of length 4 to appear is 2121.
%Y Cf. A000002, A007782, A283511.
%K nonn
%O 1,1
%A _Jeffrey Shallit_, Mar 09 2017
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