Tetrahedral number

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

The Number 2

A thing you do while watching YouTube

Bartholomew: Hay ima go The number 2
Dick: gonna watch YouTube
Bartholomew: hell yea

by EverythingIsTakenSoThisIsMyUse November 16, 2019

last number

The absolute biggest and best version of a product; usually the most expensive option.

When you order my burger, get the me the last number.
You know you're rich when you accidentally drop the last number iPhone like its nothing.

by epiqone February 11, 2020

take a number

1. to wait in line
2. to jot down a girl's number
3. to steal a math book

"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"

by Peon October 12, 2004

take a number

bitch wait you mothafuckin turn

get off my nuts, i know you wanna get wit me ho.. take a numba

by cutter October 13, 2004

take a number

Derived from the meat counter at your local grocery. You're wating for your meat? Take a number and shut the heck up. Can now be used to shut someone up who is complaining about anything, or wanting to discuss something with you that perhaps you want to brush off.

"You want to talk to me about how I ran over your cat? Take a number"

"What, teacher? My homework is late? You want to discuss my grades? Take a number"

"you want to take me out to dinner? Dude, take a number"

by nycbuckeye October 14, 2004

Simple Number

A non-complex number, like a number that doesn't have an i. Is similar to a real number.

When you multiply together complex numbers the answer is a simple number.

by SimpleNumbers July 16, 2013