Blaise Pascal may have published Traité du triangle arithmétique in 1665, but the world knew about his triangle centuries before.
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Police lineups are notoriously difficult to get right, and a huge part of that is your brain’s fault. When you’re presented with a lineup …
Jennifer Thompson was the perfect witness. She was smart, perceptive, and alert during her attack. She made a conscious effort …
The 24 game that originated in China is a fast-paced 2-player game of number manipulatiin. Your goal is to take the integers of …
Narcissistic numbers are numbers whose individual digits raised to the power of the total number of digits can be added together …
Pi is hidden everywhere, including inside a sequential alphabet clock. WHAT?! If you make a circle of the 26-letter Latin alphabet …
You all know the Pythagorean theorem, but what does a right triangle with a hypotenuse of 684912110217988900 reveal about Pi …
By starting with the prime number 71, you can make a simple recipe for pie. If 71 is the denominator, a numerator of 208 yields two …
You can determine the number of trailing zeroes on a factorial of ANY size with a pretty simple trick that involves dividing by …
A megaprime number is a prime with at least 1000000 digits. Not only is there an infinite number of megaprimes, but it means that …
Every number is unique, but not every number has special properties. Actually, most of them don’t have interesting …
You can take any number with 2 or more digits and determine almost instantly whether it’s divisible by 11, and the method is …
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You can write the numbers 1 through 10 using ONLY the digits 1 and 9… and eventually it gets a little complicated if you try not to …
Indian recreational math genius D.R. Kaprekar has a set of numbers named after him, and a Kaprekar number occurs when you …
Some numbers are happy. Some numbers are sad. How can you tell the difference?! It’s actually really easy. Square the number …
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A handful of numbers have a very special property: you can add their digits together and divide the original number by their total …