2003639

Appears in sequences

• Least x = a(n) such that number of common prime factors (ignoring multiplicity) of sigma(x) = A000203(x) and phi(x) = A000010(x) equals n.at n=5A081383
• Numbers k for which the number of common prime factors of sigma(k) and phi(k) is exactly six (ignoring multiplicity).at n=0A081398