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Prime number
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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. For example, 5 i
The Rhind Mathematical Papyrus
The Rhind Mathematical Papyrus
The small gear in this piece of farm equipment has 13 teeth, a prime number, and the middle gear has 21, relatively prime to 13.
The small gear in this piece of farm equipment has 13 teeth, a prime number, and the middle gear has 21, relatively prime to 13.
Largest known prime number
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The largest known prime number as of August 2026 is 2136,279,841 − 1, a number that has 41,024,320 digits when written in the decimal system. It was found on October 12, 2024, on a cloud-based virtual
Prime number
…slow to be practical. Particularly fast methods are available for numbers of special forms, such as Mersenne numbers, and these have been used to find large prime numbers. There are infinitely many primes, as demonstrated by Euclid around 300 BC. No known simple formula separates prime numbers from composite numbers…
Using standard A4 paper format of 50 lines per page and 75 characters per line, it would require 10,940 single-sided pages to print this prime number,
Using standard A4 paper format of 50 lines per page and 75 characters per line, it would require 10,940 single-sided pages to print this prime number, or approximately 22 reams of paper. (15 are shown here.)