241
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Number
$241$ (two hundred and forty-one) is:
- The $53$rd prime number.
- The $9$th Proth prime after $3$, $5$, $13$, $17$, $41$, $97$, $113$, $193$:
- $241 = 15 \times 2^4 + 1$
- The larger of the $17$th pair of twin primes, with $239$
- The $47$th lucky number:
- $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $193$, $195$, $201$, $205$, $211$, $219$, $223$, $231$, $235$, $237$, $241$, $\ldots$
- The $47$th positive integer $n$ such that no factorial of an integer can end with $n$ zeroes.
Also see
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