# Fun with numbers

## Happy 312 day! — how Chicago got the 312 area code

Why Chicago has the digits 3, 1, 2 in their area code

## Parsing what millions of something means in real life

What would you do with 5-10 million expired coupons EVERY WEEK?

## Counting by tens instead of ones

Happy 30th birthday for the 8th time! Perhaps you’ve heard this joke. But what if this was really true? Perhaps there could be a number system that counts that way. Instead of counting on 1s, you count on 10s. What if we turned one year older every 10 years? When you turn “38” you are …

## Prime numbers as we get older

Don’t you love it when your age is a prime number? I do. Currently I’m 37, a prime number! That only happens twice in your thirties (the other age being 31). Which decade of your life has the most prime number birthday ages? List of prime number ages, sorted by decade: 2, 3, 5, 7, …

## Special number days with receipts timestamped 07/08/09, 01/11/10, 08/09/10, 11/11/11, 12/12/12

When the numbers in the current day make an interesting combination, it’s always neat to acknowledge that day. For instance, July 8, 2009 is 07/08/09. It’s fun to get a memoir recording that unique date, because it happens only once! And how do you capture a once-in-a-lifetime date? With a printed register receipt! If you …

## Retiring ten numbers for one player

In the news highlights, I saw a Bulls player wearing what appeared to be number 23. Upon a closer look, his uniform number was revealed to be Marquis Teague wearing 25. Maybe the Bulls should retire all the numbers in the 20s.

## I got a receipt with almost all consecutive even numbers!

Earlier in the day I tweeted about thinking of trying to get a receipt with 8/10/12 14:16. But who has receipts with 24-hour time? I should try to get a receipt timestamped 8/10/12 14:16 — Matt Maldre (@spudart) August 10, 2012 Without even thinking I went to the bank to get some laundry quarters. As …

## Why you shouldn’t memorize your credit card number

I should memorize my credit card number, but I’m afraid of doing so in case I get kidnapped and they try to torture the number out of me. I think about it almost every time I enter in my credit card number. I think first: I should memorize my number, so i don’t have to …

## Is 12 noon pm or am?

Is 12 noon pm or am? I always get confused. Who would be the best person to help me out? None other than the people at AM/PM gas stations. Here is a series of letters I have written for AMPM where we get to the bottom of the matter of fixing this noon pm/am thing. …

## A new mathematical operation: the maldre, the average of extremes

Watching your weight every day is fine, but a more effective method is to see your trend over the past week. Using the new maldre math operation, you can effectively analyze your weight once a week. Almost every day on Livestrong’s Weight Tracker, I enter my weight for that day. Which is good and all, …

## Special number in my inbox

I reached 12345 messages in my m***@spu***rt.org inbox. It looks kinda cool. Note, this is not my regular gmail. This inbox is for m***@spu***rt.org, hosted by google’s gmail. It’s my general email address I use to sign up for everything. If you want to reach me personally, either use my art******@gm***.com or my contact form.