78,557

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Number

$78 \,557$ (seventy-eight thousand, five hundred and fifty-seven) is:

$17 \times 4621$

The $1$st known Sierpiński number of the second kind, although there may exist smaller

Also see

• Next: Sierpiński Number of the Second Kind

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $78,557$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $78,557$