Practice problems across 75+ categories
Practice problems frequently asked at Number Theory • 76 problems | 11 Easy | 33 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Prime Palindrome | Medium | MathNumber Theory |
| 62 | Prime Subtraction Operation | Medium | ArrayMathBinary Search |
| 63 | Replace Non-Coprime Numbers in Array | Hard | ArrayMathStack |
| 64 | Simplified Fractions | Medium | MathStringNumber Theory |
| 65 | Smallest Divisible Digit Product II | Hard | MathStringBacktracking |
| 66 | Smallest Even Multiple | Easy | MathNumber Theory |
| 67 | Smallest Value After Replacing With Sum of Prime Factors | Medium | MathSimulationNumber Theory |
| 68 | Sorted GCD Pair Queries | Hard | ArrayHash TableMath |
| 69 | Split the Array to Make Coprime Products | Hard | ArrayHash TableMath |
| 70 | Sum of Largest Prime Substrings | Medium | Hash TableMathString |
| 71 | The kth Factor of n | Medium | MathNumber Theory |
| 72 | The Number of Good Subsets | Hard | ArrayHash TableMath |
| 73 | Three Divisors | Easy | MathEnumerationNumber Theory |
| 74 | Tree of Coprimes | Hard | ArrayMathTree |
| 75 | Ugly Number III | Medium | MathBinary SearchCombinatorics |
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