Trangular
Ulam-Type 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

Spiral features:
click below for show/no-show settings.

display control

Empty Locations

Spiral

Sector Lines

tri-layer1
tri-layer2
tri-layer3
tri-layer4
tri-layer5-empty
tri-layer6-spiral
tri-layer7-sector