509,203

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Number

$509 \, 203$ (five hundred and nine thousand, two hundred and three) is:

The $42 \, 228$th prime number

The $1$st of the integers known to be a Riesel number:

$k \times 2^{509 \, 203} - 1$ is composite for all $k$

Also see

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Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $509,203$