267444

Appears in sequences

• Find smallest pair (x,y) such that x^2 - y^2 = 11...1 (n times) = (10^n-1)/9; sequence gives value of x.at n=10A048611
• Triangle read by rows: T(n,k) is the number of Schroeder paths of length 2n and having k valleys.at n=48A101282
• Numbers k >= 1 such that k^2 - r^2 is a repunit (A002275) for some 1 <= r < k.at n=30A389493