523908

Appears in sequences

• Numbers n such that sum of the squares of the prime factors of n equals the sum of the squares of the digits of n.at n=20A067184
• a(n) = 2^n - n^2 - n.at n=19A220588
• Nonpalindromic positive integers k such that the absolute value of k^2 - reverse(k)^2 is a square.at n=21A256515