164561

Appears in sequences

• Smallest argument m such that commutator[phi(m), gpf(m)] = 2n-1, where phi(m) = A000010(m) and gpf(m) = A006530(m), the largest prime factor of m.at n=22A070818
• Numbers k such that the concatenation of k with 4*k gives a square.at n=26A115535