which is satisfied by all A-sequences.
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ReferencesLevine, E. and O'Sullivan, J. "An Upper Estimate for the Reciprocal Sum of a Sum-Free Sequence." Acta Arith. 34, 9-24,
Referenced on Wolfram|AlphaChi Inequality
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Weisstein, Eric W. "Chi Inequality." From
MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ChiInequality.html