- #1
Dragonfall
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Erdos noticed that [tex]\sum(-1)^n\frac{n\log n}{p_n}[/tex] diverges, where pn is the nth prime. I can't prove this conclusively. All I can say is that PNT implies that p_n~nlogn and thus the series "resembles" [tex]\sum(-1)^n[/tex].