Project Euler & HackerRank Python Solutions
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Problems 1-9
Problem 1: Multiples of 3 and 5
Problem 2: Even Fibonacci numbers
Problem 3: Largest prime factor
Problem 4: The largest palindrome product
Problem 5: Smallest multiple
Problem 6: Sum square difference
Problem 7: Find the 10001st prime number
Problem 8: The largest product in a series
Problem 9: Special Pythagorean triplet
Problems 10-19
Problem 10: Summation of primes
Problem 11: Largest product in a grid
Problem 12: Highly divisible triangular number
Problem 13: Large sum
Problem 14: Longest Collatz sequence
Problem 15: Lattice paths
Problem 16: Power digit sum
Problem 17: Convert numbers to words
Problem 18: Maximum path sum I
Problem 19: Counting Sundays
Problems 20-29
Problem 20: Factorial digit sum
Problem 21: Amicable numbers
Problem 22: Names scores
Problem 23: Non-abundant sums
Problem 24: Lexicographic permutations
Problem 25: N-digit Fibonacci number
Problem 26: Reciprocal cycles
Problem 27: Quadratic primes
Problem 28: Number spiral diagonals
Problem 29: Distinct powers
Problems 30-39
Problem 30: Digit fifth powers
Problem 31: Coin sums
Problem 32: Pandigital products
Problem 33: Digit cancelling fractions
Problem 34: Digit factorials
Problem 35: Circular primes
Problem 36: Double-base palindromes
Problem 37: Truncatable primes
Problem 38: Pandigital multiples
Problem 39: Integer right triangles
Problems 40-49
Problem 40: Champernowne's constant
Problem 41: Pandigital Prime
Problem 42: Coded triangle numbers
Problem 43: Sub-string divisibility
Problem 44: Pentagon Numbers
Problem 45: Triangular, Pentagonal, and Hexagonal
Problem 46: Goldbach's Other Conjecture
Problem 47: Distinct Primes Factors
Problem 48: Self Powers
Problem 49: Consecutive Prime Sum
Problems 50-59
Problem 50: Consecutive Prime Sum
Problem 51: Prime Digit Replacements
Problem 52: Permuted Multiples
Problem 53: Combinatoric Selections
Problem 54: Poker Hands
Problem 55: Lychrel Numbers
Problem 56: Powerful Digit Sum
Problem 57: Square Root Convergents
Problem 58: Spiral Primes
Problem 59: XOR Decryption
Problems 60-69
Problem 60: Prime Pair Sets
Problem 61: Cyclical Figurate Numbers
Problem 62: Cubic Permutations
Problem 63: Powerful Digit Counts
Problem 64: Odd Period Square Roots
Problem 65: Convergents of e
Problem 66: Diophantine Equation
Problem 67: Maximum Path Sum II
Problem 68: Magic 5-gon Ring
Problem 69: Totient Maximum
Problems 70-79
Problem 70: Totient Permutation
Problem 71: Ordered Fractions
Problem 72: Counting Fractions
Problem 73: Counting Fractions in a Range
Problem 74: Digit Factorial Chains
Problem 75: Singular Integer Right Triangles
Problem 76: Counting Summations
Problem 77: Prime Summations
Problem 78: Coin Partitions
Problem 79: Passcode Derivation
Problems 80-89
Problem 80: Square Root Digital Expansion
Problem 81: Path Sum: Two Ways
Problem 82: Path Sum: Three Ways
Problem 83: Path Sum: Four Ways
Problem 84: Monopoly Odds
Problem 85: Counting Rectangles
Problem 86: Cuboid Route
Problem 87: Prime Power Triples
Problem 88: Product-sum Numbers
Problem 89: Roman Numerals
Problems 90-99
Problem 90: Cube Digit Pairs
Problem 91: Right Triangles with Integer Coordinates
Problem 92: Square Digit Chains
Problem 93: Arithmetic Expressions
Problem 94: Almost Equilateral Triangles
Problem 95: Amicable Chains
Problem 96: Su Doku
Problem 97: Large Non-Mersenne Prime
Problem 98: Anagramic Squares
Problem 99: Largest Exponential