1601

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Number

$1601$ (one thousand, six hundred and one) is:

The $252$nd prime number

The $12$th prime number of the form $n^2 + 1$ after $2$, $5$, $17$, $37$, $101$, $197$, $257$, $401$, $577$, $677$, $1297$:

$1601 = 40^2 + 1$

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