647569domain: NAppears in sequencesSum of the elements in any transversal of a prime(n) X prime(n) array containing the numbers from 1 to prime(n)^2 in standard order.at n=28A066886Numbers n where n^2 = x^3 + y^3; x,y>0 and gcd(x,y)=1.at n=22A099426