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