267289

Appears in sequences

• sigma(n)-n is a perfect square associated with A049226.at n=31A049228
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant >n.at n=27A210291
• Square numbers of the form prime(k) + 2*prime(k+1).at n=18A284057
• Irregular triangle read by rows: T(n,k) is the number of free polyaboloes (or polytans) with n cells of which 2*k share a hypotenuse in pairs (making up k squares), 0 <= k <= n/2.at n=52A391191