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I gave the table of inputs and outputs to both Gemini 3.0 flash and GPT 5.2 instant and they were stumped.

When I was writing this, GPT 5.1 was the latest and it got it right away. It’s the sequence of prime numbers fwiw :)

What is the function supposed to be? It’s not Celsius to Farenheit. (2C=35F, 206C=406F, …)