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Assuming you're referring to modern US $1 coins, the arithmetic is simple:
Each coin is 8.1 mm in diameter. 1 km is 1,000,000 mm. 1 million / 8.1 = 123,456 coins.
And yes, the digits in the answer are in sequence. It's one of those cool little math tricks that happens because 81 is a power of 9 (92, to be specific)
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