>>902
とりあえず30回強の反証があるので、「最大で20回以内ぐらい」が過り

　https://rio2016.5ch.io/test/read.cgi/math/1483900653/26
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https://rio2016.5ch.io/test/read.cgi/math/1483900653/101

https://rio2016.5ch.io/test/read.cgi/math/1483900653/103

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