Project Euler Solutions

Mathematical and computational problem solving

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Showing 87 of 87 problems

Multiples of 3 or 5

Even Fibonacci Numbers

Largest Prime Factor

Largest Palindrome Product

Smallest Multiple

Sum Square Difference

10001st Prime

Largest Product in a Series

Special Pythagorean Triplet

Summation of Primes

Largest Product in a Grid

Highly Divisible Triangular Number

Large Sum

Longest Collatz Sequence

Lattice Paths

Power Digit Sum

Number Letter Counts

Maximum Path Sum I

Counting Sundays

Factorial Digit Sum

Amicable Numbers

Names Scores

Non-Abundant Sums

Lexicographic Permutations

1000-digit Fibonacci Number

Reciprocal Cycles

Quadratic Primes

Number Spiral Diagonals

Distinct Powers

Digit Fifth Powers

Coin Sums

Pandigital Products

Digit Cancelling Fractions

Digit Factorials

Circular Primes

Double-base Palindromes

Truncatable Primes

Pandigital Multiples

Integer Right Triangles

Champernowne's Constant

Pandigital Prime

Coded Triangle Numbers

Sub-string Divisibility

Pentagon Numbers

Triangular, Pentagonal, and Hexagonal

Goldbach's Other Conjecture

Distinct Primes Factors

Self Powers

Prime Permutations

Consecutive Prime Sum

Prime Digit Replacements

Permuted Multiples

Combinatoric Selections

Poker Hands

Lychrel Numbers

Powerful Digit Sum

Square Root Convergents

Spiral Primes

XOR Decryption

Prime Pair Sets

Cyclical Figurate Numbers

Cubic Permutations

Powerful Digit Counts

Odd Period Square Roots

Convergents of e

Diophantine Equation

Maximum Path Sum II

Magic 5-gon Ring

Totient Maximum

Ordered Fractions

Counting Fractions

Counting Fractions in a Range

Digit Factorial Chains

Singular Integer Right Triangles

Passcode Derivation

Square Root Digital Expansion

Path Sum: Two Ways

Path Sum: Three Ways

Path Sum: Four Ways

Prime Power Triples

Roman Numerals

Square Digit Chains

Su Doku

Large Non-Mersenne Prime

Semiprimes

Concealed Square

Langton's Ant

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