• Introduction
  • Introduction
  • Disclaimer
  • Version control
• Double primorial sieve
  • PDF: The (double) Primorial sieve
  • Definition of the primorial
  • Third Primorial Sieve
  • Wheel factorization size 30
  • Last digit gap of successive primes
• Numeral systems
  • PDF: Base 10^m   numeral system
• Prime spirals
  • Ulam spiral unraveled
    • PDF: The Ulam spiral unraveled
    • PDF: Prime patterns in the Ulam spiral
    • Using a Cartesian coordinate system
    • The eight families of functions
    • Exclusion lines definition
    • Exclusion lines in the Ulam spiral
    • Coordinates of natural numbers
    • Tracking the 59th SE diagonal
    • Tracking the 41th SW diagonal
    • Ulam spiral functions (mod 210)
    • Building a spiral
  • Segmented prime spirals
    • PDF: Segmented prime spirals
    • PDF: Modulo primality test
    • Prime spiral with four segments
    • Prime spiral with three segments
    • Prime spiral with two segments
    • Prime spiral with one segment
    • Analyzing segmented prime spirals
    • Prime spiral with more segments
• Miscellaneous
  • PDF: Guestbook
  • PDF: Prime number projects for students
  • Q1 spiral  in coordinate system
  • Prime pyramid  in coordinate system
  • TXT: Prime number list < 800,000
  • Links

Primorial sieve:

en.wikipedia.org: Wheel factorization
www.primesdemystified.com: The Prime Spiral Sieve
www.g-gloeggler.de: Primes and an algorithm for computing prime factors


Last Digit gap of Prime Numbers:

www.nature.com/news: Peculiar pattern found in ‘random’ prime numbers
Youtube: Last Digit of Prime Numbers: The Last Digit of Prime Numbers - Numberphile

Ulam spiral:

en.wikipedia.org: Ulam spiral
Ulamspiral.com: A visual analysis of prime number distribution
Youtube: Prime Spirals: Prime Spirals - Numberphile
Youtube: 41 and more Ulam's Spiral: 41 and more Ulam's Spiral - Numberphile


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