44820

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.at n=33A136885
• a(n) = Sum_{k=1..n-1} k^5*sigma(k)*sigma(n-k).at n=5A259693
• Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=21A328133