How can I calculate the number with"e"? [duplicate]

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If here e is Euler then it is 2.718... but it couldn't be, the number being smaller every rows.

 0.000227202114952789 0.000179517720456525 0.000141841161842193 0.000112072029109881 8.85507390497816e-05 6.99660160393339e-05 5.52817904508328e-05 4.36794393685600e-05 3.45121496245415e-05 2.72688589626009e-05 2.15457651062528e-05 1.70238144049402e-05 1.34509150853849e-05 1.06278835242547e-05 8.39734006854666e-06 6.63493536280223e-06 5.24241806443641e-06 4.14215748301150e-06 3.27281578904617e-06 2.58592852467836e-06 2.04320278493094e-06 1.61438244735281e-06 1.27556143988364e-06 1.00785101422911e-06 7.96326727292046e-07 6.29196426502324e-07 4.97142855508031e-07 3.92804231512548e-07 3.10363837244451e-07 2.45225747946181e-07

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1 Answer

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In this case, the "$e$" in $2.45225747946181e-07$ indicates that the number coming immediately afterwards is the number of powers of $10$ that you would multiply $2.45225747946181$ by to get the number. So for example, $$2.45225747946181e-07 = 2.45225747946181 \cdot 10^{-07} = 0.000000245225747946181$$ $$2.45225747946181e-05 = 2.45225747946181 \cdot 10^{-05} = 0.0000245225747946181$$ $$2.45225747946181e-01 = 2.45225747946181 \cdot 10^{-01} = 0.245225747946181$$ $$2.45225747946181e 03 = 2.45225747946181 \cdot 10^{3} = 2452.25747946181$$ In this particular case, it has nothing to do with Euler's Constant. For more information, look at the Wikipedia article on Scientific Notation.

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