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A331476
The (10^n)-th even-digit number.
2
0, 28, 688, 24888, 608888, 22288888, 446888888, 20048888888, 402088888888, 8042888888888, 260868888888888, 6228488888888888, 224680888888888888, 4604628888888888888, 202202688888888888888, 4044064888888888888888, 80882408888888888888888
OFFSET
0,2
LINKS
FORMULA
a(n) = A014263(10^n).
MAPLE
b:= proc(n) local m, r; m, r:= n-1, 0;
while m>0 do r:= 2*irem(m, 5, 'm'), r od;
parse(cat(r))/10
end:
a:= n-> b(10^n):
seq(a(n), n=0..20);
CROSSREFS
Sequence in context: A269473 A278805 A160141 * A239408 A215857 A185987
KEYWORD
nonn,base
AUTHOR
Alois P. Heinz, Jan 17 2020
STATUS
approved