998976domain: NAppears in sequencesMonotonic ordering of nonnegative differences 10^i-4^j, for 40>=i>=0, j>=0.at n=32A192172Subsets of {1,2,...,n-6} without differences equal to 3 or 6.at n=40A224810Numbers that are divisible by the sum of their exponentially odd divisors.at n=9A387820