Pi challenge


I’m thinking about going after the North American record for Pi recall, which is 15,314 and has stood since 2007. I recently memorized around 1,200 just for fun and it went pretty quickly, and I think I could do it. Maybe go for 20,000 or so. If it goes well, I may consider later trying for the world record, which is officially a little over 70,000, but I’d have to see where my life is going to tackle that.

Anyone have any good suggestions for this endeavor? I’d make sure it was properly proctored so I could make the official list: http://pi-world-ranking-list.com/index.php?page=rules. I think I’d probably want to do it via keyboard entry for ease of checking, and for the avoidance of amibiguity.

(Silvio B.) #2

I’ve never memorized Pi and I’ve always been impressed by how people can memorize so many digits. I’d have to make like 2500 loci in order to memorize 15000 digits.

How will you do it?


Cool… decided on your system yet? An overlapping 3-digit system (so 5 digit per loci) is pretty common with folks going over 10,000 because then you can also do the Everest challenge much faster. I’d consider doing that as well if you go past the 10,000 anyway.

I remember I used a PAO system the first time I did it The sixth digit would be the first in my next 5 number block. I liked that one, because it gave a nice “look ahead.” On the other hand 1,000 object system with 2 objects per loci stays more “unique” as you go on and on.

Here is one of my old posts on pi, which includes a link to my memory palace on Memrise in case you don’t have everything set up already: Paris - 2,000 Digits Of Pi


What is the Everest challenge?


A.k.a.: Pi Matrix

The first 10,000 digits of Pi are divided into 2,000 5-digit blocks. The testers call out one of these 5-digit sequences, and the candidate must reply with the 5-digit numbers on either side of the number chosen. This happens 50 times.



Thanks. I think Nelson Dellis did a podcast about his experience doing that event.


yup, this is the link to his blog where he talks about it…


I’ll be using my 3-digit system, with two images/locus. My 3-digit system has about 80% objects, 20% people/characters. I’ll have to create a lot of new palaces, for sure, but I don’t think it’ll be a problem. I had already created a lot of new ones for a challenge I was preparing for the 2018 USA Memory Championships where we had to memorize NFL Hall of Famers, Rock and Roll Hall of Famers, and lots of details about the Periodic Table. I don’t think I’ll do the Everest challenge. I want to keep things simple, and I’ve already started with this particular system.


What website have people used for the digits of pi? There are lots of them out there but has anyone found that one website is superior to others? If I were doing this I would be afraid of memorizing the wrong digits and I would want to be 100% that I’m encoding the correct numbers.

(Francis Blondin) #10

http://www.eveandersson.com/pi/pitrainer/ is by far the best website I’ve found to test yourself on pi digits.

(Josh Cohen) #11

It only goes up to 1,000 digits at the moment, but if you want to try recalling random indexed digits, there is a pi-guessing game on the site.


Hi @Josh,

would it be possible to add an “offset by 1”-option to the pi-guessing game? At the moment it considers the 3 before the decimal point the first digit. The aforementioned 5 digit blocks for the Pi Matrix only consider the digits after the decimal point. I think the same is true for any kind of record attempt as far as digits memorized.

14159 26535

So technically:
0th digit = 3
1st digit = 1
2nd digit = 4

(Josh Cohen) #13

Sure, I’ve added it to the to-do list. (It may take a bit of time before I can get to it though.)


I use http://www.eveandersson.com/pi/digits/. You can choose however many digits you want to generate, grouped by however many you want. I chose mine grouped by threes, since I have a 3-digit system, and it created a long columns of groups of 3 digits, which I then copy/pasted in a Google Docs spreadsheet so I could easily type in the corresponding image, and break them up into manageable study amounts, then color-code the blocks based on how well memorized I have them.

(Mark GM) #15

You can use the Pi Matrix Trainer on