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Which is bigger, 5235^{23} or 23523^{5}?

5235^{23} is bigger: 5235^{23} = 1.19209 × 101610^{16} and 23523^{5} = 6436343.

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The curve ln x / x, which decides every comparison of a^b with b^a5101520250.050.10.150.20.250.30.350.4x = 5x = 23peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 5^23 against 23^5 is the same question as which of the two marked points is higher; the curve peaks at x = e.

How to work it out

  1. 1

    Compute both exactly: 5235^{23} = 11920928955078125 and 23523^{5} = 6436343.

  2. 2

    So 5235^{23} is bigger.

  3. 3

    The reason: taking logs, aba^{b} against bab^{a} is the same as ln⁡aa\frac{\ln a}{a} against ln⁡bb\frac{\ln b}{b}. The function ln⁡xx\frac{\ln x}{x} rises until x=e≈2.718x = e \approx 2.718 and falls afterwards. Both 5 and 23 are past e, where the function is decreasing, so the larger exponent loses and 5235^{23} > 23523^{5}.

    ln⁡55 > ln⁡2323\frac{\ln 5}{5}\ >\ \frac{\ln 23}{23}
LaTeX source of the formulas on this page
\[ 5^{23} = 1.19209\times 10^{16}\ >\ 23^{5} = 6436343 \]
\[ \frac{\ln 5}{5}\ >\ \frac{\ln 23}{23} \]

Questions

Which is bigger, 5235^{23} or 23523^{5}?

5235^{23} is bigger: 5235^{23} = 1.19209 × 101610^{16} and 23523^{5} = 6436343.

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