回复:印度奥赛题(2星半):无穷序列的最大值
来源:
innercool
于
2009-09-17 17:30:32
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Let S_k:=k^(1/k), then k=3 assumes the maximum value. Because S_k <= S_{k+1} yields k<=(1+1/k)^k which is monotone increasing from 2 to e=2.717828...
So k=2 is the last one that satisfies the inequality.