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Katadromes: digits in base 3 are in strict descending order.
0

%I #7 Jan 06 2014 15:09:30

%S 0,1,2,3,6,7,21

%N Katadromes: digits in base 3 are in strict descending order.

%K nonn,base,fini,full,easy

%O 1,3

%A _Olivier GĂ©rard_