五十一角形
( ( ( ( x 1 + x 16 ) + ( x 13 + x 4 ) ) + ( ( x 25 + x 8 ) + ( x 19 + x 2 ) ) ) + ( ( ( x 5 + x 22 ) + ( x 14 + x 20 ) ) + ( ( x 23 + x 11 ) + ( x 7 + x 10 ) ) ) ) = 1 ( ( ( ( x 1 + x 16 ) + ( x 13 + x 4 ) ) + ( ( x 25 + x 8 ) + ( x 19 + x 2 ) ) ) − ( ( ( x 5 + x 22 ) + ( x 14 + x 20 ) ) + ( ( x 23 + x 11 ) + ( x 7 + x 10 ) ) ) ) 2 = 17 ⋮ ( ( ( ( x 1 − x 16 ) 2 − ( x 13 − x 4 ) 2 ) 2 − ( ( x 25 − x 8 ) 2 − ( x 19 − x 2 ) 2 ) 2 ) 2 + ( ( ( x 5 − x 22 ) 2 − ( x 14 − x 20 ) 2 ) 2 − ( ( x 23 − x 11 ) 2 − ( x 7 − x 10 ) 2 ) 2 ) 2 ) = 6885 ( ( ( ( x 1 − x 16 ) 2 − ( x 13 − x 4 ) 2 ) 2 − ( ( x 25 − x 8 ) 2 − ( x 19 − x 2 ) 2 ) 2 ) 2 − ( ( ( x 5 − x 22 ) 2 − ( x 14 − x 20 ) 2 ) 2 − ( ( x 23 − x 11 ) 2 − ( x 7 − x 10 ) 2 ) 2 ) 2 ) 2 = 40264857 {\displaystyle {\begin{aligned}&((((x_{1}+x_{16})+(x_{13}+x_{4}))+((x_{25}+x_{8})+(x_{19}+x_{2})))+(((x_{5}+x_{22})+(x_{14}+x_{20}))+((x_{23}+x_{11})+(x_{7}+x_{10}))))=1\\&((((x_{1}+x_{16})+(x_{13}+x_{4}))+((x_{25}+x_{8})+(x_{19}+x_{2})))-(((x_{5}+x_{22})+(x_{14}+x_{20}))+((x_{23}+x_{11})+(x_{7}+x_{10}))))^{2}=17\\&\quad \vdots \\&((((x_{1}-x_{16})^{2}-(x_{13}-x_{4})^{2})^{2}-((x_{25}-x_{8})^{2}-(x_{19}-x_{2})^{2})^{2})^{2}+(((x_{5}-x_{22})^{2}-(x_{14}-x_{20})^{2})^{2}-((x_{23}-x_{11})^{2}-(x_{7}-x_{10})^{2})^{2})^{2})=6885\\&((((x_{1}-x_{16})^{2}-(x_{13}-x_{4})^{2})^{2}-((x_{25}-x_{8})^{2}-(x_{19}-x_{2})^{2})^{2})^{2}-(((x_{5}-x_{22})^{2}-(x_{14}-x_{20})^{2})^{2}-((x_{23}-x_{11})^{2}-(x_{7}-x_{10})^{2})^{2})^{2})^{2}=40264857\\\end{aligned}}}