4161600

Appears in sequences

• Numbers n such that phi(sigma(k))/sigma(phi(k)) < phi(sigma(n))/sigma(phi(n)) for all k < n and n is the smallest positive integer with this property.at n=9A227927
• a(n) = smallest square which is the product of a minimal set of distinct numbers not less than n.at n=33A245530
• Areas of primitive Heronian triangles K which are perfect squares.at n=41A248108
• Numbers k such that sigma(k) - 3k is prime.at n=26A306492