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Duplicate of A009490.
0

%I #3 May 11 2007 03:00:00

%S 1,2,3,4,6,6,9,11,14,16,20,23,27,31,35,43,47,55,61,70,78,88,98,111,123

%N Duplicate of A009490.

%K dead

%O 1,2