Archive of posts filed under the Numbers category.

## 02/17/2017 — Happy Permutation Day!

Today we celebrate a Permutation Day! I call days like today permutation days because the digits of the day and the month can be rearranged to form the year.

We can also consider today a Transposition Day, as we need only a single transposition (an exchange of two numbers) to turn the year into the day and date.

Celebrate Permutation Day by mixing things up! Try doing things in a different order today. Just remember, for some operations, order definitely matters!

## 01/27/2017 — Happy Permutation Day!

Today we celebrate the first Permutation Day of the year!  I call days like today permutation days because the digits of the day and the month can be rearranged to form the year.

Celebrate Permutation Day by mixing things up!  Try doing things in a different order today.  Just remember, for some operations, order definitely matters!

## 12/06/2016 — Happy Permutation Day!

Today we celebrate the final Permutation Day of the year!  I call days like today permutation days because the digits of the day and the month can be rearranged to form the year.

Celebrate Permutation Day by mixing things up!  Try doing things in a different order today.  Just remember, for some operations, order definitely matters!

## 10/26/2016 — Happy Permutation Day!

Today we celebrate a Permutation Day!  I call days like today permutation days because the digits of the day and the month can be rearranged to form the year.

We can also consider today a Transposition Day, as we need only a single transposition (an exchange of two numbers) to turn the year into the day and date.

Celebrate Permutation Day by mixing things up!  Try doing things in a different order today.  Just remember, for some operations, order definitely matters!

## 9/25/16 — Happy Pythagorean Square Day!

Happy Pythagorean Perfect Square Day!

We’ve had a lot of fun dates this year:  several Geometric Mean Days, several Square Days, and even a Power of 2 Day!  But I’m pretty sure that the numbers of dates all being perfect squares and satisfying the Pythagorean Theorem is the rarest of them all!