# Number Theory Practice Questions - [Prefix sum](https://cses.fi/problemset/task/1646) - [Binomial Coefficients ](https://cses.fi/problemset/task/1079) (Precomputation, modular arithmetic) - [Emordnilap](https://codeforces.com/problemset/problem/1777/B) - [Counting divisors](https://cses.fi/problemset/task/1713) - [Exponentiation](https://cses.fi/problemset/task/1095) (Binary Exponentiation, modular arithmetic) - [Counting Primes](https://leetcode.com/problems/count-primes/description/) (Sieve) ## Extra Problems - [Not Divisible]( https://atcoder.jp/contests/abc170/tasks/abc170_d) - [ Zero Remainder Array](https://codeforces.com/contest/1374/problem/D) - [Prime Arrangements](https://leetcode.com/problems/prime-arrangements/) (modular arithmatic, primality test)