1719277560

Appears in sequences

• Smallest x such that sigma(x) = n*phi(x), or -1 if no such x exists.at n=22A055234
• Least balanced numbers (A020492): m such that the quotient sigma(m)/phi(m) equals the n-th prime.at n=8A063513
• a(n) = Min{x : sigma(x) = n*phi(x), x is not a prime}, the least nonprime solutions to sigma(x) = n*phi(x); special balanced numbers.at n=22A088830