163
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Number
$163$ (one hundred and sixty-three) is:
- The $38$th prime number
- The $9$th prime number after $53$, $71$, $103$, $107$, $109$, $149$, $151$, $157$ which cannot be expressed as either the sum of or the difference between a power of $2$ and a power of $3$
- The $33$rd lucky number:
- $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $115$, $127$, $129$, $133$, $135$, $141$, $151$, $159$, $163$, $\ldots$
- This expression relating $e$ and $\pi$ comes within $10^{-12}$ of an integer:
- $e^{\pi \sqrt {163} } \approx 262 \, 537 \, 412 \, 640 \, 768 \, 743 \cdotp 99999 \, 99999 \, 99250 \ldots$
Also see
- Previous ... Next: Prime Number
- Previous ... Next: Primes not Sum of or Difference between Powers of 2 and 3
- Previous ... Next: Lucky Number
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $163$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $163$