Published on: 2025-06-11 15:00:50
A shard of smooth bone etched with irregular marks dating back 20,000 years puzzled archaeologists until they noticed something unique – the etchings, lines like tally marks, may have represented prime numbers. Similarly, a clay tablet from 1800 B.C.E. inscribed with Babylonian numbers describes a number system built on prime numbers. As the Ishango bone, the Plimpton 322 tablet and other artifacts throughout history display, prime numbers have fascinated and captivated people throughout histor
Keywords: mersenne number numbers prime primes
Find related items on AmazonPublished on: 2025-06-16 09:54:40
Right-Truncatable Prime Counter This C program efficiently calculates the number of right-truncatable primes for a given number of digits. It uses a custom hash table for fast primality lookups and the primesieve library for high-performance prime generation. A right-truncatable prime is a prime number that, when its rightmost digit is successively removed, results in a sequence of primes. For example, 739 is a right-truncatable prime because: 739 is prime. Removing the rightmost '9' gives 7
Keywords: digit number prime primes right
Find related items on AmazonPublished on: 2025-08-17 07:25:19
If you ask a person on the street whether 1 is a prime number, they’ll probably pause, try to remember what they were taught, and say “no” (or “yes” or “I don’t remember”). Or maybe they’ll cross the street in a hurry. On the other hand, if you ask a mathematician, there’s a good chance they’ll say “That’s an excellent question” or “It’s kind of an interesting story…” Some people treat the non-primeness of 1 as a mathematical fact and nothing more, but those people are missing out on something
Keywords: domain number numbers prime primes
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