Send me a private Mastodon message with a positive integer number, before the end of September 2022 (Irish time). Whoever sends me the smallest number that is unique (i.e. a number no one else sent), picks a charity of their choice and I will pay €10 to that charity (must accept PayPal donations). If you send more than 1 number, only the first one counts. Anything other than a single positive integer number (dates, fractions, equations, cat pictures, URLs) will be ignored.
Boosts welcome.
P. S. I'm going to publish the winning number and the total number of valid entries. I'm *not* going to publish the winning account details or the name of the charity they pick without their consent.