397+398+399+400+40 1+402+403+404+405+406+407+408+409+4 10+4 1 1+4 12+4 13+4 14+4 15+4 1 6+4 17=465438+ 08+4 19+420+42 1+422+423+424+425+426+427+428+429+430+43 1+432+433+434+435+436+437-3

This equation is regular. The difference between the first numbers of every two equations is odd numbers 5, 7, 9,,,,, and the length of the left side of each equation increases 1 in turn. For example, the left length of the first equation is 3, and the left length of the second equation is 4, which are accumulated in turn, and the length of the nineteenth equation is 2 1. The first number is1+5+7+7+9+1+kloc-0/3+15+17+19+2/kloc.

Based on this, the top result is obtained.