Notice

This is being written on Wikipedia. However when I get my own wiki up and running, this wiki will be transferred.

Introduction

Welcome to this Project Euler sub-wiki. In these pages I hope to help you solve any Project Euler problems you may be stuck on. Please note that no answers will be given. Once you have solved a puzzle, you will be able to enter the answer into a text box to reveal the code I used. The methods I give may not be the most efficient way, but if they give you the correct answer, who cares?

What Is Project Euler

Project Euler is a website located at projecteuler.net which contains over 200 maths problems of varying difficulty. The maths problems are constructed in a way where it is almost impossible to solve them without writing a computer program to solve it - You are actually encouraged to do this. Each question supposedly is solvable in one minute on a normal computer. However I have come across some where I was unable to achieve this goal.

What you can do

Once you have solved the problem, you will be able add your code to a code archive to show others what you have done.

About Me

I personally have completed 66/227 problems at the time of writing (001-059, 063, 067, 074, 079, 080, 092, 097), and am currently solving problem 96. I write my programs in PHP. The only one I have solved using pen and paper is problem 009.

Problems

Problem 001-010

Problem 001	Add all the natural numbers below one thousand that are multiples of 3 or 5.
Problem 002	Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed four million.
Problem 003	Find the largest prime factor of a composite number.
Problem 004	Find the largest palindrome made from the product of two 3-digit numbers.
Problem 005	What is the smallest number divisible by each of the numbers 1 to 20?
Problem 006	What is the difference between the sum of the squares and the square of the sums?
Problem 007	Find the 10001^st prime.
Problem 008	Discover the largest product of five consecutive digits in the 1000-digit number.
Problem 009	Find the only Pythagorean triplet, {a, b, c}, for which a + b + c = 1000.
Problem 010	Calculate the sum of all the primes below two million.

Problem 011-020

Not Complete

Problem 021-030

Not Complete

Problem 031-040

Not Complete

Problem 041-050

Not Complete

Problem 051-060

Not Complete

Problem 061-070

Not Complete

Problem 071-080

Not Complete

Problem 081-090

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Problem 091-100

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Problem 101-110

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Problem 111-120

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Problem 121-130

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Problem 131-140

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Problem 141-150

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Problem 151-160

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Problem 161-170

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Problem 171-180

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Problem 181-190

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Problem 191-200

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Problem 201-210

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Problem 211-220

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Problem 221-227

Not Complete