The Triangular Patterns of 6, 66, and 666

Today on 6/6 I want to share some facts about the numbers 6, 66, and 666, and their relationship to "doubly triangular numbers". In the future, I'll make an episode on my main ‪@ComboClass‬ channel explaining more about how/why "222111" showed up... Make sure to also check out my latest Combo Class episode about "Ramsey Numbers" here:    • The Mystery of the Unknown "Ramsey Numbers"   Here's a short I made previously with some other facts about 666:    • 6 Fun Facts About the Number 666... #shorts   And here are the links to a few recent shorts on my ‪@ComboClass‬ channel you may have missed:    • Shorts   (NEW)    • Shorts      • Shorts   This video was filmed by Carlo Trappenberg. Special thanks to Evan Clark and to my Patreon supporters: Max, George Carozzi, Peter Offut, Tybie Fitzhugh, Henry Spencer, Mitch Harding, YbabFlow, Joseph Rissler, Plenty W, Quinn Moyer, Julius 420, Philip Rogers, Ilmori Fajt, Brandon, August Taub, Ira Sanborn, Matthew Chudleigh, Cornelis Van Der Bent, Craig Butz, Mark S, Thorbjorn M H, Mathias Ermatinger, Edward Clarke, and Christopher Masto, Joshua S, Joost Doesberg, Adam, Chris Reisenbichler, Stan Seibert, Izeck, Beugul, OmegaRogue, Florian, William Hawkes, Michael Friemann, Claudio Fanelli, and Julian Zassenhaus. (To join that list of people supporting this channel, and get cool bonus content, check out the Combo Class Patreon at   / comboclass  ) If you want to send me anything (including old extra clocks/dice/etc.), here's my private mailbox address (not my home address). If you're going to send anything, please watch this short video first:    • Video   Domotro 1442 A Walnut Street, Box # 401 Berkeley, CA 94709 Links: Main channel:    / comboclass   Patreon:   / comboclass   Discord:   / discord   Subreddit:   / comboclass   If you want to reach out to possibly collaborate or help with Combo Class somehow, my email is: combouniversity (at) gmail (dot) com Combo Class, taught by Domotro, is a crazy educational show where you can have fun learning rare things about math, science, language, and more! This is the channel for Domotro's Combo Class bonus videos, shorts, and livestreams - make sure you're also subscribed to the main ‪@ComboClass‬ channel where the main episodes go! DISCLAIMER: any use of fire, tools, or other science experiments in this series is always done in a safe and professional way. Do not try to copy any actions you see in this series yourself.