437999

Appears in sequences

• Composite numbers n such that the sum of divisors of n, sigma(n), divided by the number of divisors, d(n) and sigma(n) minus n are both rational squares.at n=19A049226
• Numbers k such that phi(sigma(phi(k))) = sigma(k).at n=27A066462
• Numbers k such that sopf(k) = (1/2)*(sopf(k+1) + sopf(k-1)), where sopf(x) = sum of the distinct prime factors of x.at n=30A075846