MathDB
Putnam 1971 B6

Source:

April 6, 2022
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Problem Statement

Let δ(x)\delta (x) be the greatest odd divisor of the positive integer xx. Show that ∣∑n=1xδ(n)/n−2x/3∣<1,| \sum_{n=1}^x \delta (n)/n -2x/3| <1, for all positive integers x.x.
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