1004850

Appears in sequences

• Smaller of unitary amicable pair.at n=19A002952
• Least number k such that k^n + n and k^n - n are both prime, or 0 if no such number exists.at n=40A239475
• Smallest m, such that there are exactly n solutions of the equation (m+k)' = m' + k', where 1 <= k <= 2*m and x' = A003415(x), the arithmetic derivative of x.at n=30A258138
• a(n) is the smallest member of the n-th purely periodic unitary sigma aliquot cycle listed in A336216.at n=33A336219