What is Tetrahedral Number?
1.
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.
See
Random Words:
1.
The most Ass-Kicking Ninja in the series "Naruto". He wields the massive blade called Kubikiri Houcho or Head chopping blade. ..
1.
(transmogrification of expiration)A game of chance where one covers or ignores the expiration date on any refrigerated food out of inten..
