MathDB
Convergence of infinite series

Source: ICMC 7 Round 2 Problem 4

March 12, 2024
Convergenceseriesreal analysis

Problem Statement

Let (tn)n1(t_n)_{n\geqslant 1} be the sequence defined by t1=1,t2k=tkt_1=1, t_{2k}=-t_k and t2k+1=tk+1t_{2k+1}=t_{k+1} for all k1.k\geqslant 1. Consider the series n=1tnn1/2024.\sum_{n=1}^\infty\frac{t_n}{n^{1/2024}}.Prove that this series converges to a positive real number.
Proposed by Dylan Toh