451
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Number
$451$ (four hundred and fifty-one) is:
- $11 \times 41$
- The $6$th Fermat pseudoprime to base $4$ after $15$, $85$, $91$, $341$, $435$:
- $4^{451} \equiv 4 \pmod {451}$
- The smallest positive integer the decimal expansion of whose reciprocal has a period of $10$:
- $\dfrac 1 {451} = 0 \cdotp \dot 00221 \, 7294 \dot 9$
Historical Note
$451 \fahr$ is approximately the temperature at which paper catches fire.
Fahrenheit 451 is a novel by Ray Bradbury set in a dystopian future in which books are routinely censored by burning them.