275472

Appears in sequences

• Numbers k such that k and k^2 use only the digits 2, 4, 5, 7 and 8.at n=20A137097
• a(1) = 1, a(2) = 6, a(n+2) = 6*a(n+1) + (n + 1)*(n + 2)*a(n).at n=6A142985
• 1000-gonal numbers: a(n) = n*(499*n - 498).at n=24A195163