The (double) Primorial sieve  &  Prime spirals E-mail

The Ulam spiral is a prime spiral with  four  segments. The prime spiral with just  one  segment is analyzed to better understand the difference in density of prime numbers along horizontal, vertical and diagonal lines in the Ulam spiral.

The full description is found in the document   Analyzing segmented prime spirals.pdf.  


Prime spirals: Analyzing segmented prime spirals.