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%I #11 Oct 05 2019 04:53:10
%S 1,20,3200000,400,512000000000,64000000,
%T 703687441776640000000000000000000000000000000000000000000000,8000,
%U 900719925474099200000000000000000000000000000000000000000000000000000
%N Smallest power of 20 that begins with n.
%Y Cf. A009964, A180705, A180726, A180727.
%K nonn,base
%O 1,2
%A _Daniel Mondot_, Sep 18 2010