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331(1): 09/19(金)11:02 ID:N54MxCu9(1/5) AAS
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google：
series Σ _{k＝0,1,…,+∞}(1/(k!＋1)) irrational number proof

AIモード 回答
The question of whether the series Σ _{k＝0,1,…,+∞}(1/(k!＋1)) is irrational appears to be an open problem in mathematics. No established proof has been found to confirm its irrationality, though it is strongly suspected to be an irrational number. 
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(引用終り)

で、”irrational appears to be an open problem in mathematics. No established proof has been found to confirm its irrationality”
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