Kaprekar's Constant

Prove that (1/x + 1/y + 1/z) is greater than 3

163 and Ramanujan Constant - Numberphile

Why is this number everywhere?

Russell's Paradox - a simple explanation of a profound problem

The Oldest Unsolved Problem in Math

Why you didn't learn tetration in school[Tetration]

The SAT Question Everyone Got Wrong

Very Confident PLAYER Thinks She Can OUTCLASS 64-Year Old EFREN REYES

Seorang Atheis Kalah Debat Sama Anak Usia 7 Tahun

How To Speak Fluently In English About Almost Anything

The Simple Trick For Hard Sudokus

The Simple Question that Stumped Everyone Except Marilyn vos Savant

Solving a 'Harvard' University entrance exam

This Trick CANNOT Be Explained - Revealed

This Math Trick is Black Magic

50 Constants Explained

MAGICAL Indian Math Discovery - Numbers 495 and 6174 (Kaprekar Constants)

Magic numbers: 1089 and 6174

Tesla’s 3-6-9 and Vortex Math: Is this really the key to the universe?

Kaprekar's Constant - A Mystery Number.