The Ulam Spiral

… and many other spirals¬†
inspired by it …

Ulam Spiral .

Spiral origin at “0”.

Spiral origin color-coded as a 6-fold

“1” represented on spiral.
(Adjacent to “0”, “0” is a 6-fold.)

“2” & “3” not represented on spiral.
(Not adjacent to a 6-fold.)

Color-coded number-groups:
click below for show/no-show settings.

display control

6-folds

prime adjacents

composite adjacents

layer-bg
layer-1-21
layer-2-21
layer-3-21
layer-4-21