Well-structured HackerRank Project Euler Problem Solutions (JavaScript) Table of Contents S.No Title Difficulty 1 Multiples of 3 and 5 2 Even Fibonacci Numbers 3 Largest Prime Factor 4 Largest Palindrome Product 5 Smallest Multiple 6 Sum Square Difference 7 10001st Prime 8 Largest Product in a Series 9 Special Pythagorean Triplet 10 Summation of Primes 11 Largest Product in a Grid 12 Highly Divisible Triangular Number 13 Large Sum 14 Longest Collatz Sequence 15 Lattice Paths 16 Power Digit Sum 17 Number to Words 18 Maximum Path Sum I 19 Counting Sundays 20 Factorial Digit Sum 21 Amicable Numbers 22 Names Scores 23 Non-Abundant Sums 24 Lexicographic Permutations 25 N-Digit Fibonacci Number 26 Reciprocal Cycles 27 Quadratic Primes 28 Number Spiral Diagonals 29 Distinct Powers 30 Digit Nth Powers 31 Coin Sums 32 Pandigital Products 33 Digit Cancelling Fractions 34 Digit Factorials 35 Circular Primes 36 Double-base Palindromes 37 Truncatable Primes 38 Pandigital Multiples 39 Integer Right Triangles 40 Champernowne's Constant 41 Pandigital Prime 42 Coded Triangle Numbers 43 Sub-string Divisibility 44 Pentagon Numbers 45 Triangular, Pentagonal, and Hexagonal 46 Goldbach's Other Conjecture 47 Distinct Prime Factors 48 Self Powers 49 Prime Permutations 50 Consecutive Prime Sum 51 Prime Digit Replacements 52 Permuted Multiples 53 Combinatoric Selections 54 Poker Hands 55 Lychrel Numbers 56 Powerful Digit Sum 57 Square Root Convergents 58 Spiral Primes 59 XOR Decryption 60 Prime Pair Sets 61 Cyclical Figurate Numbers 62 Cubic Permutations 63 Powerful Digit Counts 64 Odd Period Square Roots 65 Convergents of e 66 Diophantine Equation 67 Maximum Path Sum II 68 Magic n-gon Ring 69 Totient Maximum 70 Totient Permutation 71 Ordered Fractions 72 Counting Fractions 73 Counting Fractions in a Range 74 Digit Factorial Chains 75 Singular Integer Right Triangles 76 Counting Summations 77 Prime Summations 78 Coin Partitions 79 Passcode Derivation 80 Square Root Digital Expansion 81 Path Sum: Two Ways 82 Path Sum: Three Ways 83 Path Sum: Four Ways 84 Monopoly Odds 85 Counting Rectangles 86 Cuboid Route 87 Prime Power Triples 88 Product-sum Numbers 89 Roman Numerals 90 Cube Digit Pairs 91 Right Triangles with Integer Coordinates 92 Square Digit Chains 93 Arithmetic Expressions 94 Almost Equilateral Triangles 95 Amicable Chains 96 Su Doku 97 Large Non-Mersenne Prime 98 Anagramic Squares 99 Largest Exponential 100 Arranged Probability 101 Optimum Polynomial 102 Triangle Containment 103 Special Subset Sum: Optimum 104 Pandigital Fibonacci Ends 105 Special Subset Sum: Testing 106 Special Subsets Sum: Meta Testing 107 Minimal Network 108 Diophantine Reciprocals I 109 Darts 110 Diophantine Reciprocals II 111 Primes with runs 112 Bouncy Numbers 113 Non-Bouncy Numbers 114 Counting Block Combinations I 115 Counting Block Combinations II 116 Red, Green or Blue Tiles 117 Red, Green or Blue Tiles 118 Pandigital Prime Sets 119 Digit Power Sum 120 Square Remainders 121 Disc Game Prize Fund 122 Efficient Exponentiation 123 Prime Square Remainders 124 Ordered Radicals 125 Palindromic Sums 126 Cuboid Layers 127 ABC-Hits 128 Hexagonal Tile Differences 129 Repunit Divisibility 130 Composites with Prime Repunit Property 131 Prime Cube Partnership 132 Large Repunit Factors 133 Repunit Non-Factors 134 Prime Pair Connection 135 Same Differences 136 Singleton Difference 137 Fibonacci Golden Nuggets 138 Special Isosceles Triangles 139 Pythagorean Tiles 140 Modified Fibonacci Golden Nuggets 141 Investigating Progressive Numbers 142 Perfect Square Collection 143 Investigating the Torricelli Point of a Triangle 144 Investigating Multiple Reflections of a Laser Beam 145 How Many Reversible Numbers Are There Below One-billion? 146 Investigating a Prime Pattern 147 Rectangles in Cross-hatched Grids 148 Exploring Pascal's Triangle 149 Searching for a Maximum Sum Subsequence 150 Searching a Triangular Array for a Sub Triangular Having Minimum Sum 151 Paper Sheets of Standard Sizes: An Expected Value Problem 152 Writing 1/2 as a Sum of Inverse Squares 153 Investigating Gaussian Integers 154 Exploring Pascal's Pyramid 155 Counting Capacitor Circuits 156 Counting Digits 157 Solving the Diophantine Equation 158 Exploring Strings 159 Digital Root Sums of Factorisations 160 Factorial Trailing Digits 161 Triominoes 162 Hexadecimal Numbers 163 Cross Hatched Triangles 164 Number for Which no Three Consecutive Digits Have a Sum Greater than a Given Value 165 Intersections 166 Criss Cross 167 Investigating Ulam Sequences 168 Number Rotations 169 Exploring the Number of Different ways a Number can be Express as a Sum of Powers of 2 170 Find the Largest 0 to 9 Pandigital that can be Formed by Concatenating Products 171 Finding Number for Which the Sum of Squares of the Digits is a Square 172 Investigating Numbers with Few Repeating Digits 173 Using up to One Millions Tiles how Many Different Hollow Square Laminae Can be Formed 174 Counting the Number of Hollow Square Laminae that can form One, Two, Three Distinct Arrangements 175 Fractions Involving the Number of Different Ways a Number Can be Expressed as a Sum of Powers of 2 176 Rectangular Triangles That Share a Cathetus 177 Integer Angled Quadrilaterals 178 Step Numbers 179 Consecutive Positive Divisors 180 Rational Zeros of a Function of Three Variables 181 Investigating in How Many Ways Objects of Two Different Colours Can Be Grouped 182 RSA Encryption 183 Maximum Product of Parts 184 Triangles Containing the Origin 185 Number Mind 186 Connectedness of a Network 187 Semiprimes 188 The Hyperexponentiation of a Number 189 Tri-colouring a Triangular Grid 190 Maximising a Weighted Product 191 Prize Strings 192 Best Approximations 193 Squarefree Numbers 194 Coloured Configurations 195 Inscribed Circles of Triangles with Angle of 60 Degrees 196 Prime Triples 197 Investigating the Behaviour of a Recursively Defined Sequence 198 Ambiguous Numbers 199 Iterative Circle Packing 200 Find the 200th Prime Proof Sqube Containing the Contiguous SubString "200" 201 Subsets with a Unique Sum 202 Laserbeam 203 Squarefree Binomial Coefficients 204 Generalised Hamming Numbers 205 Dice Game 206 Concealed Square 207 Integer Partition Equations 208 Robot Walks 209 Circular Logic 210 Obtuse Angled Triangles MIT License Copyright (c) 2025 Anuj Singh
