Formula:
$$f(x) = \left(\frac{1}{500} +
\sum_{j=1}^{25}\frac{1}{j + \sum_{i=1}^{2}(x_i - a_{ij})^6}\right)^{-1}$$
where \(a_{ij}\) are predefined constants forming a 5x5 grid.
Global minimum: \(f(-32, -32) \approx 0.998\)
Characteristics:
The 25 minima are located at points from a 5x5 grid with coordinates
\((-32, -16, 0, 16, 32)\) in each dimension.