140014domain: NAppears in sequencesNumbers k which are concatenations k=x//y such that x^2 + y^2 is a multiple of k.at n=37A162463Numbers n whose cubes are concatenations n^3 = x//y such that x is an anagram of y.at n=23A162946G.f.: Sum_{n>=0} x^n/(1 - x^2*(1+x)^n).at n=18A340775