<p>For a base <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(b \ge 2\)</EquationSource> </InlineEquation>, the <i>b</i>-elated function, <InlineEquation ID="IEq3000"> <EquationSource Format="TEX">\(E_{2,b}\)</EquationSource> </InlineEquation>, maps a positive integer written in base <i>b</i> to the product of its leading digit and the sum of the squares of its digits. A <i>b</i>-elated number is a positive integer that maps to 1 under iteration of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(E_{2,b}\)</EquationSource> </InlineEquation>. The height of a <i>b</i>-elated number is the number of iterations required to map it to 1. We determine the fixed points and cycles of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(E_{2,b}\)</EquationSource> </InlineEquation> and prove a range of results concerning sequences of <i>b</i>-elated numbers and <i>b</i>-elated numbers of minimal heights. Although the <i>b</i>-elated function is closely related to the <i>b</i>-happy function, the behaviors of the two are notably different, as demonstrated by the results in this work.</p>

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  • N. Bradley Fox,
  • Nathan H. Fox,
  • Helen G. Grundman,
  • Rachel Lynn,
  • Changningphaabi Namoijam,
  • Mary Vanderschoot

摘要

For a base \(b \ge 2\) , the b-elated function, \(E_{2,b}\) , maps a positive integer written in base b to the product of its leading digit and the sum of the squares of its digits. A b-elated number is a positive integer that maps to 1 under iteration of \(E_{2,b}\) . The height of a b-elated number is the number of iterations required to map it to 1. We determine the fixed points and cycles of \(E_{2,b}\) and prove a range of results concerning sequences of b-elated numbers and b-elated numbers of minimal heights. Although the b-elated function is closely related to the b-happy function, the behaviors of the two are notably different, as demonstrated by the results in this work.