%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