I learned the 50 first decimals with a friend last summer. It was very random to come up with that. It's a good way to practice memory though.
Then I went too long for not checking if I still knew it right, and didn't want to remember it wrong, so now I know only ten.
Then I went too long for not checking if I still knew it right, and didn't want to remember it wrong, so now I know only ten.