1000000512domain: NAppears in sequencesSmallest n-digit number divisible by 2^n.at n=9A050621a(n) = Sum_{0<d|n, n/d odd} d^9.at n=9A096962a(n) = Sum_{d|n, n/d==1 mod 4} d^9 - Sum_{d|n, n/d==3 mod 4} d^9.at n=9A321833Sum of the 9th powers of the divisor complements of the odd proper divisors of n.at n=9A352055