224536

Appears in sequences

• Numbers k such that phi(k) = sigma(core(k)) where phi(k) is the Euler totient function, sigma(k) the sum of divisors of k and core(k) the squarefree part of k (the smallest integer such that k*core(k) is a square).at n=20A069552
• Numbers n such that sigma(n) = 5*phi(n).at n=19A136547
• Numbers k such that sigma(k) = psi(k) + phi(k).at n=29A389478