Since the dawn of electronic computing, programs for finding primes have been used as a test of the hardware.
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. The first six primes are 2, 3, 5, 7, 11, and 13. But why? What good are prime numbers?
The chance that one thing will happen instead of a different thing
Odds provide a measure of the likelihood of a particular outcome. They are calculated as the ratio of the number of events that produce that outcome to the number that do not. Odds are commonly used in gambling and statistics. Odds also have a simple relation with probability: the odds of an outcome are the ratio of the probability that the outcome occurs to the probability that the outcome does not occur.
A manhole is just what it seems, an access hole, large enough for a man to climb down to the sewer. So why aren’t they rectangular or square? Well, a round cover can’t fall through its hole. A square cover turned diagonally will slide right through its square opening.
Zero – the figure or symbol 0, which in the Arabic notation for numbers stands for the absence of quantity
Zero describes nothing, like how much extra money I have. The number zero as we know it arrived in the West circa 1200, most famously delivered by Italian mathematician Fibonacci (aka Leonardo of Pisa), who brought it, along with the rest of the Arabic numerals, back from his travels to North Africa.
In the Textus Receptus manuscripts of the New Testament, the Book of Revelation (13: 17–18) cryptically asserts 666 to be “man’s number” or “the number of a man” associated with the Beast, a hostile creature that appears briefly about two-thirds into the apocalyptic vision. 666 has become one of the most widely recognized symbols for the Antichrist or, alternatively, the devil.