75660

Appears in sequences

• Powers of fourth root of 20 rounded up.at n=15A018104
• Nonnegative k such that 3*k + 1 is a perfect cube.at n=20A121628
• The 4-tuple (2, ((2*n+1)^2-1)/2, ((2*n+3)^2-1)/2, a(n)), where a(n) = 4*(3 + 20n + 42n^2 + 32n^3 + 8n^4), has Diophantus's property that the product of any two distinct terms plus one is a square.at n=5A160372
• Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.at n=26A285956