A sure sign of a captain idea — one that quickens the imagination — is when it sprouts more ideas. As I studied the number pattern that lead to this graphic, I began to wonder.
Coloring only the odd triangles means I left the even triangles white. Even numbers are those which can be divided by two without having a remainder. What if I leave numbers which can be divided by three white? What about leaving out those divided by four? Five?
What you see below is the answer!