CP-Snippets

Efficient-Divsibility-Trick-7-and-13

• used here: https://codeforces.com/contest/2043/problem/B

• https://thesobersobber.github.io/CP-Snippets/ Efficient Divibility Trick for 7 and 13
  

• github-snip-file

https://www.mathematicalgemstones.com/gemstones/pearl/a-faster-divisibility-rule-for-7/