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Kaushik
  • Member for 6 years, 9 months
  • Last seen more than 4 years ago
  • Kanpur, Uttar Pradesh, India
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Is there a bijection $f: \mathbb{N} \rightarrow \mathbb{N}$ such that the series $\sum\limits_n \frac{1}{n+f(n)} $ is convergent?