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20 in base 20-n.
2

%I #6 Mar 30 2012 16:45:24

%S 10,11,12,13,14,15,16,17,18,19,20,22,24,26,32,40,110,202,10100,

%T 11111111111111111111

%N 20 in base 20-n.

%K fini,nonn,base,full

%O 0,1

%A _N. J. A. Sloane_.