The mathematical flex to end all flexes! Leonhard Euler casually looking at 1.64493406684822643640... and immediately recognizing it as π²/6. This is like someone glancing at your 20-digit phone password and saying "Oh that's just the square root of your birthday multiplied by your social security number."
For the curious nerds: π²/6 ≈ 1.6449... is actually the sum of the infinite series 1 + 1/4 + 1/9 + 1/16 + ... (or Σ 1/n² from n=1 to ∞). Euler solved this in 1735 after mathematicians had been stumped for nearly a century. The man didn't just calculate numbers—he recognized them like old friends at a party.
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