2172649216domain: NAppears in sequencesSmaller of amicable pairs of Euler's first form with GCD a power of 2.at n=3A049023Numbers n such that Sum_{i=1..j} 1/d(i) - Sum_{i=1..k} 1/p(i) is an integer, where p are the prime factors of n, counted with multiplicity, and d its divisors.at n=14A238922