242656domain: NAppears in sequencesL.g.f.: Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^n)^d.at n=24A205489Numbers k such that the deficiency of k^2 is itself a square > 1.at n=4A289274Numbers k such that the deficiency of k^2 is itself a square.at n=22A289275