。。。

https://www.cnblogs.com/onioncyc/p/8461267.html
https://www.cnblogs.com/yydyz/p/10441165.html
https://www.cnblogs.com/chenxiaoran666/p/Mobius.html
https://blog.csdn.net/skywalkert/article/details/50500009
https://www.cnblogs.com/Paul-Guderian/p/7723031.html
https://www.luogu.org/blog/An-Amazing-Blog/mu-bi-wu-si-fan-yan-ji-ge-ji-miao-di-dong-xi
https://blog.csdn.net/kf11__/article/details/81988158
http://www.doc88.com/p-6744902151748.html
https://www.cnblogs.com/onioncyc/p/7978976.html
https://www.cnblogs.com/WR-Eternity/p/11006008.html
https://www.cnblogs.com/Jackpei/p/10989300.html
https://www.cnblogs.com/fengzhiyuan/p/8645246.html
https://0x131cc05.github.io/2019/03/07/莫比乌斯反演/#more
https://www.cnblogs.com/zhoushuyu/p/8275530.html

基础数论：
https://www.cnblogs.com/zjp-shadow/p/9267675.html#二次探测定理
https://www.cnblogs.com/zjp-shadow/p/7773566.html

https://www.cnblogs.com/Parsnip/p/10764776.html
http://blog.miskcoo.com/2014/06/bzoj-3157#more-24
http://dna049.com/2016/01/21/Formula-of-pow-sum-of-natural-number/