15,877

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Number

$15 \, 877$ (fifteen thousand, eight hundred and seventy-seven) is:

The $1849$th prime number


The $18$th prime $p$ such that $p \# - 1$, where $p \#$ denotes primorial (product of all primes up to $p$) of $p$, is prime:
$3$, $5$, $11$, $13$, $41$, $89$, $317$, $337$, $991$, $1873$, $2053$, $2377$, $4093$, $4297$, $4583$, $6569$, $13 \, 033$, $15 \, 877$


Also see


Historical Note

The number $15 \, 877 \# - 1$ was demonstrated to be prime by Chris K. Caldwell in $1995$.


Sources