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%I #7 Jan 17 2020 16:30:03
%S 0,28,688,24888,608888,22288888,446888888,20048888888,402088888888,
%T 8042888888888,260868888888888,6228488888888888,224680888888888888,
%U 4604628888888888888,202202688888888888888,4044064888888888888888,80882408888888888888888
%N The (10^n)-th even-digit number.
%H Alois P. Heinz, <a href="/A331476/b331476.txt">Table of n, a(n) for n = 0..698</a>
%F a(n) = A014263(10^n).
%p b:= proc(n) local m, r; m, r:= n-1, 0;
%p while m>0 do r:= 2*irem(m, 5, 'm'), r od;
%p parse(cat(r))/10
%p end:
%p a:= n-> b(10^n):
%p seq(a(n), n=0..20);
%Y Cf. A014263, A075879.
%K nonn,base
%O 0,2
%A _Alois P. Heinz_, Jan 17 2020