$$ f(x) = -20 \exp { -0.2\sqrt { \dfrac{1}{D} \sum_{i=1}^{D}x_i^2 } } - \exp { \dfrac{1}{D} \sum_{i=1}^{D}x_i^2 cos(2\pi x_i) } $$

$$ f(x) = \sum_{i=1}^{D} | x_i sin(x_i) + 0.1x_i | $$

$$ f(x_1, x_2) = ( 1.5 - x_1 + x_1 x_2)^2 + ( 2.25 - x_1 + x_1 x_2^2)^2 + $$ $$ ( 2.625 - x_1 + x_1 x_2^3)^2 $$

$$ f(x) = \sum_{i=1}^{D} (x_i^2 + 2x_i+1^2 - 0.3cos(3\pi x_i) - 0.4cos(4\pi x_i+1) + 0.7) $$

$$ f(x_1, x_2) = -(x_2 + 47)sin(\sqrt{|x_2 + \dfrac{x_1}{2} + 47|}) + $$ $$ sin(\sqrt{|x_1 - (x_2) + 47|}) (-x_1) $$

$$ f(x_1, x_2) = [1 + (x_1 + x_2 + 1)^2 x $$ $$ (19 - 14x_1 + 3x_1^2 - 14x_2 + 6x_1x_2 + 3x_2^2)] x $$ $$ [30 + (2x_1 − 3x_2)^2(18 − 32x_1 + 12x_1^2 + 48x_2 −36x_1x_2 + 27x_2^2)] $$

$$ f_{grw}(x)=\frac{1}{4000} \sum_{i=1}^{D} {x_{i}^{2}} - \prod_{i=1}^{D}\cos\left (\frac{x_{i}}{\sqrt{i}} \right ) +1$$

$$ f_{lvy}(x)= \sum_{i=1}^{D-1}($$ $$ \sin^{^{2}}(3\pi x_{i}) +$$ $$ (x_{i}-1)^{2}\left[1+\sin^{2}(3\pi x_{i+1}))\right] +$$ $$ (x_{i+1}-1)^{2}$$ $$ \left[1+\sin ^{^{2}}(2\pi^{x_{i+1}}))\right])$$

$$ f_{mic}(x)= -\sum_{i=1}^{D}\sin(x_{i})(\sin(ix_{i}^{2}/\pi))^{2p}$$

$$ f_{pth}(x)=\sum_{i=1}^{D}\left (0.5+\frac{\sin ^{2}\sqrt{(100x_{i}^{2}+x_{i+1}^{2})}-0.5}{1+0.001(x_{i}^{2}-2x_{i+1}x_{i+1}+x_{i+1}^{2})^{2}}\right )$$

$$ f_{qdr}(x)=\sum_{i=1}^{D}\left (\sum_{j=i}^{i}x_{j} \right )^{2} $$

$$ f_{qrt}(x)=\sum_{i=1}^{D} i x_{i}^{4}$$

$$ f(x) = \sum_{i=1}^{D} x_i * sin(α)cos(Β) + (x_{i+1modD} + 1)cos(α)sin(Β) $$, where D >= 2, $$ α = \sqrt{|x_{i+1}+1-x_i} $$ and $$ Β = \sqrt{|x_{i+1}+1+x_i} $$

$$ f(x) = \sum_{i=1}^{D} (x_i^2 - 10cos(2\pi{}x_i) + 10) $$

$$ f(x) = \sum_{i=1}^{D-1} (100(x_{i+1} - x_i^2)^2 + (x_i - 1)^2 $$, D >= 2

$$ f(x) = -cos(2\pi{}\sum_{i=1}^{D}x_i^2) + 0.1\sqrt{\sum_{i=1}^{D}x_i^2} +1 $$

$$ f(x) = \sum_{i=1}^{D}|x_i| + \prod_{i=1}^{D}|x_i| $$

$$ f(x) = -\sum_{i=1}^{D}(x_isin(\sqrt{|x_i|})) $$

$$f_{6h}(x_{1},x_{2})=4x_{1}^{2}-2.1x_{1}^{4}+\frac{1}{3}x_{1}^{6}+x_{1}x_{2}-4x_{2}^{2}+4x_{2}^{4} $$

$$ f_{skr}(x)=10D+\sum_{i=1}^{D}(y_{i}^{2}-10\cos(2\pi y_{i}))$$ $$ \text{ where } y_{i}=\begin{cases} 10x_{i},&\text{if}\ x_{i}=1\\ x_{i},&\text{otherwise} \end{cases} $$

$$ f_{sph}(x)=\sum_{i=1}^{D}x_{i}^{2} $$

$$ f_{stp}(x)=\sum_{i=1}^{D}(\left \lfloor x_{i} +0.5 \right \rfloor)^{2}$$

$$f_{wei}(x)=\sum_{i=1}^{D}\sum_{k=0}^{20}\left [ 0.5^{k}\cos(2 \pi3^{k}(x_{i}+0.5)) \right ]-$$ $$D\sum_{k=0}^{20}\left [0.5^{k}\cos(2 \pi3^{k}0.5) \right ] $$

$$ f_{zak}(x)=\sum_{i=1}^{D}x_{i}^{2}+\left [ \sum_{i=1}^{D}ix_{i}/2 \right ]^{2}+\left [ \sum_{i=1}^{D}ix_{i}/2 \right ]^{4}$$