Math & Number Theory

Essential number theory and math patterns that appear across interviews: GCD/LCM, sieve of Eratosthenes, modular exponentiation, digit manipulation, and number-theoretic DP.

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Problem	Difficulty	Platform	Action
Fizz Buzz	Easy	LC	Solve
Palindrome Number	Easy	LC	Solve
Happy Number	Easy	LC	Solve
Power of Three	Easy	LC	Solve
Add Digits	Easy	LC	Solve
Roman to Integer	Easy	LC	Solve
Excel Sheet Column Number	Easy	LC	Solve
Self Dividing Numbers	Easy	LC	Solve