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What special property is shared by 56198 and 57494 and no others?

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The numbers 56198 and 57494 represent

the only two PSE users that have earned the Tumbleweed badge. The puzzle should be future-proof since the badge is retired.

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  • $\begingroup$ Yep, you got it! $\endgroup$ – Rand al'Thor Nov 15 at 11:16

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