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Name the mathematical constant

Name the notable mathematical constant which each decimal expansion approximates

You may give your answers in any order.

Results and stats
      • Value
      • Name
      • Clue
      • 0.6931472...
      •  
      • Formerly used for multiplication
      • 1.0594631...
      •  
      • Important to piano tuners
      • 1.4142136...
      •  
      • Upset the ancient Greeks
      • 1.6180340...
      •  
      • Important in architecture
      • Value
      • Name
      • Clue
      • 2.7182818...
      •  
      • Compound interest
      • 3.1415927...
      •  
      • Circles
      • 4.6692016...
      •  
      • Fractals

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