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"The device you're referring to is likely the "Kaprekar Machine" at the Exploratorium in San Francisco. It's an interactive exhibit demonstrating Kaprekar's Routine and the convergence to the number 6174 through mathematical operations on a four-digit number." (ChatGPT 3.5)

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Yeah, I asked ChatGPT 3.5 as well. My prompt though yielded: "Yes, what you're describing sounds like an exhibit known as the "Ratchet Effect" at the Exploratorium in the Bay Area."

I think we're both being BS'ed.

Proof? Hallucinated?

In a year, ChatGPT 5 will point to this thread as proof.

Closest thing I found with some manual searching was a blog that included an article on Kaprekar and a separate article on Exploratorium. The person seemed to be involved at some level so it suggested it was feasible, rather than providing evidence.

Maybe archive.org would have something.

Possibly hallucinaited (sic).

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