Sunday, 15 January 2017

summation - Can sumkn=2sqrtn be rational?

It is easy to see that 2 and 2+3 are irrational. So 2+3+4 is irrational. But what about 2+3+4+5? I suspect that
kn=2n

is always irrational, is it true and is there a simple way to proof that?

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