143877domain: NAppears in sequencesNumbers k such that phi(k)*sigma(k) is a cube.at n=29A114077Numbers m such that abs(K(m+1) - K(m)) = 2, and both m and m+1 are squarefree (A005117), where K(m) = A002034(m) is the Kempner function.at n=32A346212