It was first mentioned by a mathematician, William Foster Lloyd, in 1833; the idea goes back to Aristotle.
数学家William FosterLloyd在1833年首次提出这个问题，其源头甚至可以追溯到亚里士多德。
It was first mentioned by a mathematician, William Foster Lloyd, in 1833; the idea goes back to Aristotle.
数学家William FosterLloyd在1833年首次提出这个问题，其源头甚至可以追溯到亚里士多德。
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