#sacks spiral

[paranthropus]

Sacks spiral https://en.wikipedia.org/wiki/Ulam_spiral#/media/File:Sacks_spiral.svg

[smellthecedar]

1) Ulam spiral. When integers are consecutively spiraled, prime numbers seemingly line up in diagonal lines.

2) Sack's spiral. Non-negative integers plotted on an Archimedean spiral rather than the square spiral used by Ulam.

3) Klauber triangle. A variant on the Ulam spiral in which numbers form straight lines.