172080

Appears in sequences

• Fixed points of the function a(n) = phi(sigma(n) - phi(n) - d(n)), where phi(n) is the Euler totient function, sigma(n) the sum of divisors of n and d(n) the number of divisors of n.at n=12A243995
• Numbers k such that k and k+1 are both products of 2 triangular numbers.at n=24A356748