19611648domain: NAppears in sequencesTable B(m,n), read by antidiagonals, where B(m,n) is the number of ways integers 1,..,m*n can be put into an m X n grid so that every adjacent (NESW) pair of integers are coprime.at n=24A116542Numbers k such that the denominator of sigma(sigma(k))/k is equal to 2.at n=10A330598