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Learn about the process and methods of generating random numbers or symbols that cannot be reasonably predicted better than by random chance. Compare true random number generators (RNGs) and pseudorandom number generators (PRNGs) and their applications in various fields.
Cipher algorithms and cryptographic hashes can be used as very high-quality pseudorandom number generators. However, generally they are considerably slower (typically by a factor 2–10) than fast, non-cryptographic random number generators.
Learn about the history and usage of fictitious telephone numbers in movies, music and other media. Find out why 555-555-5555 is not a valid number in North America and what are some examples of famous phone numbers.
Area code 323 covers much of the City of Los Angeles and several inner suburbs, originally split off from 213 in 1998. It will be overlaid by area code 738 in 2024. See the full list of California area codes and their service areas.
Mersenne Twister is a general-purpose PRNG based on a Mersenne prime. It has a 32-bit version, MT19937, and a 64-bit version, MT19937-64, with different sequences.
A hardware random number generator (HRNG) is a device that generates random numbers from a physical process capable of producing entropy. Learn about the history, uses, and types of HRNGs, and how they differ from pseudorandom number generators (PRNGs).
Learn about the history, service area and popular culture of the telephone area codes 619 and 858 for most of San Diego County in California. Find out how they were created, split and merged over time and why they are used by some celebrities.
Learn about the history and service area of area codes 707 and 369, which serve the northwestern part of California, including the San Francisco Bay Area and the North Coast. Find out how to dial 988 for the National Suicide Prevention Lifeline and when to switch to ten-digit dialing.