Suppose, that you need to compute 25! in PHP. It is a fairly large number. PHP will tell you that it is 1.551121004E+25, nice and short. No surprises here. Let's look under the hood, though. Sometimes you need, for example to do something with each digit of the number. So, ...

This article is a result of a fairly well known computer programming problem I came across online some time ago. Essence of the problem was about finding the longest Collatz sequence, that is the largest number of terms for a number less than N, with N being 1 000 000. For ...

In this article I look at how to find all prime numbers below a certain positive number N, as well as their sum. We do not know how primes are distributed. There is no function, which reliably finds all primes less then a large natural number. However, we do known an algorithm, ...

We have stored more and more data, sometimes logins, passwords and whole databases, by popular cloud storage services today. On one hand, keeping files with them seems like a good idea. You get access to your files on demand, on any device you connect to service with, from ...