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The (10^n)-th even-digit number.
2

%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