A Counterexample to a Purported Construction of Normal Numbers
John M. Campbell
Department of Mathematics and Statistics
Dalhousie University
Halifax, NS B3H 4R2
Canada
Abstract:
Pollack and Vandehey noted that a purported construction of normal
numbers given by Szüsz and Volkmann requires an
additional condition. As we demonstrate, not only is this condition
required in part of the proof of Szüsz and Volkmann's main result,
but their original claim is false. We give an explicit counterexample
via a decimal expansion that satisfies the conditions of Szüsz and
Volkmann, but is not normal. This counterexample provides a non-normal
analogue of the normal number 0.(1)(4)(9)(16)(25) ... considered
by Besicovitch.
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(Concerned with sequences
A000040
A001191
A033307
A033308
A380904.)
Received
January 29 2025;
revised versions received February 25 2025; January 12 2026.
Published in Journal of Integer Sequences,
May 20 2026.
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