🔢 Number Theory
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- ▶Units digit of powers
- 🔒Modular exponentiation
- 🔒Power towers (iterated Euler)
- 🔒Counting divisors
- 🔒GCD & LCM
- 🔒Chinese Remainder
- 🔒Trailing zeros of n!
- 🔒Perfect-square divisors
- 🔒Quadratic congruences
- 🔒Coprime factorisations
- 🔒Multiplicative order
- 🔒Prime power in a binomial (Kummer)
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