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2^n-1 written 2^n-1 times.
0

%I #4 Apr 19 2019 09:05:57

%S 1,3,3,3,7,7,7,7,7,7,7,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,

%T 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,

%U 31,31,31,31,31,31,31,31,63,63,63,63,63,63,63,63,63,63,63,63,63,63,63,63

%N 2^n-1 written 2^n-1 times.

%t Table[Table[2^n-1,2^n-1],{n,6}]//Flatten (* _Harvey P. Dale_, Apr 19 2019 *)

%Y Cf. A000225.

%K nonn

%O 1,2

%A _Paul Curtz_, Nov 05 2007