pb notable >>16510731, >>16510748, >>16510837 Counting the days (561) since Q's last post

wouldn't that be 17 x 33 = 561?

>>16512761

>>16512746

>>16512767

>33rd TRIANGULAR #

whut?!

Schafli symbol for tetrahedron is {3,3}

https://en.wikipedia.org/wiki/Tetrahedron

>>16512827

Indeed!