Problem 199
Problem 199 is focused on packing in as many circles as possible into a larger circle and determining the remaining area that has not been filled in. After t...
Problem 58
In this problem, we are looking at the diagonal values of a counter-clockwise spiral (example shown below), and counting how many of them are prime. In the s...
Problem 18 & 67
As Problem 18 and Problem 67 are the same (Problem 67 is a larger version of Problem 18), I will cover the solution to both in this post. Both of these probl...
Problems 3 & 7
Given that these two problems are both related to prime numbers and are relatively simple, I describe them both here. In Problem 3, we are searching for the ...
Problem 2
In this problem, the task is to sum all even Fibonacci numbers whose values do not exceed four million. The Fibonacci sequence is a series of numbers where e...
Problem 85
In this problem we are interested in counting the number of sub-rectangles in a rectangular grid. Specifically, we are interested in the area of a grid that ...
Problem 1
The problem can be found here. Paraphrased, we want to find the sum of all natural numbers below 1000 that are a multiple of 3 or 5.