Project Euler: Problem 7
Problem: What is the 10,001st prime number? Q. How do we find the nth prime number?A. Build a Sieve of Eratosthenes large enough to contain the nth prime number. Q.…
Project Euler: Problem 6
Problem: Find the difference between the sum of the square of the first 100 natural numbers, and the square of the sum of the first 100 natural numbers. Solution: PHP…
Project Euler: Problem 5
Problem: Find the smallest number with all the integers 1 to 20 as factors (i.e. divisible without a remainder). Q. What is the simplest way to find the lowest number…
Project Euler: Problem 4
Problem: Find the longest palindrome made from the product of two three-digit numbers. Q: How do we work out if a number is a palindrome?A: Convert it to a string…
Project Euler: Problem 3
Problem: What is the highest prime factor of n? In this case: n = 600851475143 Q: What is the simplest way to find the highest prime factor of n?A: Try dividing…
Project Euler: Problem 2
Problem: Find the sum of all the even numbers in the Fibonacci sequence whose values do not exceed 4 million. Q: What is the minimum section of the sequence that…
Project Euler: Problem 1
Problem: Find the sum of all numbers below 1000 which are a multiple of 3 or 5. Solution: Given the numbers involved, we can simply brute-force the answer by simply…
Invoice Ninja and Vagrant
Invoice Ninja is a self-hosted and open source invoicing solution written using a PHP framework called Laravel. I wanted to give it a try as a replacement for my existing…
Opening start menu with the Windows key in Xubuntu
My distribution of choice for all my non-server machines is Xubuntu, due to its stripped down and low resource usage desktop environment. One thing that has irked me for ages…
Keeping an idle SSH connection alive
One of the servers which I login to on a regular basis has the annoying habit of dropping any SSH connections where there has been no activity for more than…