by Chris M. April 5, 2004

by tuffpuff November 12, 2007

"yes you're excused to the bathroom Johnny"-teacher
"thanks"-johnny
..5 minutes later
classmates-"ewww Johnny did you number one or two,"
"A number 3....
bitches."
-johnny
"thanks"-johnny
..5 minutes later
classmates-"ewww Johnny did you number one or two,"
"A number 3....
bitches."
-johnny
by Ass Hat3321 December 14, 2010

by Stirfry September 11, 2003

"Yo, take a number, foo, can't you sees that I'm busy?"
"Hey, did you take a number from her?"
"The only reason I went to class was to take a number"
"Hey, did you take a number from her?"
"The only reason I went to class was to take a number"
by Peon October 12, 2004

by EverythingIsTakenSoThisIsMyUse November 16, 2019

The {n}th tetrahedral number is the sum of the first n Triangular numbers. Triangular numbers are the sum of the first n integers (1, 3, 6, 10, 15, etc.), and taking the sum of the triangular numbers results in the tetrahedral numbers (1, 4, 10, 20, 35, etc.)
The fifth tetrahedral number is the sum of the first five triangular numbers. The first five triangular numbers are 1, 3=1+2, 6=1+2+3, 10=1+2+3+4, and 15=1+2+3+4+5, so the sum of these numbers is 1+3+6+10+15= 35.
by EmeraldofSeattle December 14, 2008
