412500

Appears in sequences

• Triangle read by rows: T(n,k)=(-1)^k*(2n/(2n-k))5^(n-k)*binomial(2n-k,k) (0<=k<=n, n>=1).at n=39A104064
• Numbers x whose 10's complements y have the same sum of divisors of x, with x <> y.at n=24A300796