3217

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Number

$3217$ (three thousand, two hundred and seventeen) is:

The $455$th prime number

The index of the $18$th Mersenne prime after $2$, $3$, $5$, $7$, $13$, $17$, $19$, $31$, $61$, $89$, $107$, $127$, $521$, $607$, $1279$, $2203$, $2281$:

$M_{3217} = 2^{3217} - 1 \approx 2 \cdotp 591 \times 10^{968}$

Also see

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