709784

Appears in sequences

• Numbers m such that 2*m - sigma(m) is a divisor of m and greater than one, where sigma = A000203 is the sum of divisors.at n=31A060326
• a(n) = ((n-th prime)^5-(n-th prime)^2)/2.at n=6A138431
• Deficient-perfect numbers: Deficient numbers n such that n/(2n-sigma(n)) is an integer.at n=51A271816