%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_.