David Radcliffe
@radcliffe.dev
Mathematician and dog walker in St. Paul, MN
I will send $5 to the first person to successfully contribute a sequence to the OEIS that contains the number 5318008 in the DATA section. Some conditions apply. I'm not actually going to send the money.
October 11, 2025 at 12:48 AM
I will send $5 to the first person to successfully contribute a sequence to the OEIS that contains the number 5318008 in the DATA section. Some conditions apply. I'm not actually going to send the money.
I don't think you're ready for the shutdown
October 1, 2025 at 1:10 AM
I don't think you're ready for the shutdown
This is a Mersenne prime.
September 13, 2025 at 6:14 PM
This is a Mersenne prime.
Matthew 19 has some helpful tips.
August 25, 2025 at 3:00 PM
Matthew 19 has some helpful tips.
Euler has been cancelled by the NY Times.
August 19, 2025 at 5:33 PM
Euler has been cancelled by the NY Times.
I have been exploring the following problem. If we start with 1, and repeatedly double and/or reverse the digits, is it possible to reach every number? It's easy to show that multiples of 3 and 11 cannot be reached, but can we reach every other number?
June 22, 2025 at 3:28 AM
I have been exploring the following problem. If we start with 1, and repeatedly double and/or reverse the digits, is it possible to reach every number? It's easy to show that multiples of 3 and 11 cannot be reached, but can we reach every other number?
Raise your hand if you wouldn't recognize George Clooney either, or if you don't think that using a wheelchair is disqualifying.
May 14, 2025 at 12:48 PM
Raise your hand if you wouldn't recognize George Clooney either, or if you don't think that using a wheelchair is disqualifying.
Minnesota did it better.
April 13, 2025 at 3:15 PM
Minnesota did it better.
Not the most important issue, but do economists typically use asterisks to denote multiplication? This seems more typical of coders to me.
April 3, 2025 at 10:18 PM
Not the most important issue, but do economists typically use asterisks to denote multiplication? This seems more typical of coders to me.
I would like to speak to the manager.
March 20, 2025 at 7:45 PM
I would like to speak to the manager.
The word that I have in mind appeared in yesterday's NYT crossword. Content warning added to avoid spoilers.
March 9, 2025 at 11:10 AM
The word that I have in mind appeared in yesterday's NYT crossword. Content warning added to avoid spoilers.
Head Start is shutting down its social media accounts.
March 7, 2025 at 1:11 AM
Head Start is shutting down its social media accounts.