5743237domain: NAppears in sequencesNumbers k such that the quotient (sigma(k) + sigma(k+1))/sigma(2*k+1) is smaller than 1/2.at n=3A091291Super anti-abundant numbers.at n=37A192269Numbers n such that Sum(1/d*_n)>Sum(1/d*_m) for all m<n, where d*_n and d*_m are the anti-divisors of n and m.at n=26A192294