工具

OEIS(数列)
http://oeis.org/

Generic two integer variable equation solver(a⁢x² + b⁢x⁢y + c⁢y² + d⁢x + e⁢y + f = 0 的整数解)
https://www.alpertron.com.ar/QUAD.HTM

https://webdemo.myscript.com/

https://csacademy.com/app/graph_editor/

SAM Drawer
https://yutong.site/sam/