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.
1. an undeadrooster.
2. a penis hungry for brains.
3. a cockfeeling seriously worn out.
4. an undead jerk.
1. "cock-a-doodle zo..
1.
(1) containing the elements of adorable and ridiculous (2) somthing that is at once cute, but absurd (3) used to describe suggestions, t..