245344domain: NAppears in sequencesCubes written in base 6.at n=27A004636Least k such that Sum_{i=1..k} gcd(k,i) = n * sigma(k).at n=10A072108Numbers m with even length such that phi(m)=phi(d_1^d_2)*phi(d_3^d_4) *...*phi(d_(k-1)^d_k) where d_1 d_2 ... d_k is the decimal expansion of m.at n=6A112011