## 21Longest mathematical proof

The longest mathematical proof is 15,000 pages long, involved more than 100 mathematicians and took 30 years just to complete it.

## 22Per Enflo

A mathematician named Per Enflo solved Problem 153 in the "Scottish Book" in 1972 and was awarded a live goose as promised by Polish mathematician named Stanisław Mazur, who posed the problem in 1936.

## 23Vi Hart

In 2012, a mathematician named Vi Hart sent an open letter to Nickelodeon proving Spongebob's Pineapple was geometrically impossible. Pineapple designer Kenny Pittenger responded on his blog (in video description) by posting a new "mathematically correct" design. This new design is now used on the show.

## 248675309

8675309 is the fourth most common 7-digit password, number one, of course, is 1234567.

## 25Narcissistic number

A Narcissistic number is a number that is the sum of its own digits each raised to the power of the number of digits.

## 26Vinculum

The line between the 2 numbers in a fraction is called the Vinculum.

## 27Fry Lewis Richardson

A mathematician named Fry Lewis Richardson discovered that it is impossible to measure the length of coastlines in a meaningful manner. This so-called Coastline Paradox later led to the creation of the field of Fractal Geometry.

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## 28Ada Lovelace

A female English mathematician named Ada Lovelace wrote an algorithm in the mid-1800s designed to be carried out by a machine. As a result, she is often regarded as the first computer programmer.

## 29Integral symbol

The integral symbol (∫) used in math is based on the long S symbol because Leibniz thought of the integral as an infinite sum of infinitesimal summands.

## 30Johann Gustav Hermes

A German mathematician named Johann Gustav Hermes spent a decade writing a 200-page manuscript about drawing a regular 65537 sided polygon with a compass and a straightedge.