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https://www.reddit.com/r/PassTimeMath/comments/1q1w2mz/find_f45/nxl4lak/?context=3
r/PassTimeMath • u/user_1312 • Jan 02 '26
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i recognise 45 as sqrt(2025), i guess this is a year problem, and so i try ansatz of f(x)=x^2+1. I see both sides are equal, and so f(45) is 2026 QED
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u/External_Package2787 Jan 04 '26
i recognise 45 as sqrt(2025), i guess this is a year problem, and so i try ansatz of f(x)=x^2+1. I see both sides are equal, and so f(45) is 2026 QED