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  • Číslo 197 leží v posloupnosti 1, 9, 7, 17, 33, 57, 107, 197, 361, ... Čísla s touto vlastností, jako 14, 19, 28, 47, 61, 75, 197, 742, ..., jsou tzv. Keithova čísla. Není známo, zda jich je nekonečně mnoho. Dokazujeme, že je jen konečně mnoho K. čísel s jedinou dekadickou číslicí a že množina K. čísel má nulovou hustotu. (cs)
  • Number 197 is contained in the sequence 1, 9, 7, 17, 33, 57, 107, 197, 361, ... Numbers with this property, such as 14, 19, 28, 47, 61, 75, 197, 742, ..., are called Keith numbers. It is not known if there are infinitely many of them. We prove that there are only finitely many Keith numbers using just one decimal digit and that the set of Keith numbers has density zero.
  • Number 197 is contained in the sequence 1, 9, 7, 17, 33, 57, 107, 197, 361, ... Numbers with this property, such as 14, 19, 28, 47, 61, 75, 197, 742, ..., are called Keith numbers. It is not known if there are infinitely many of them. We prove that there are only finitely many Keith numbers using just one decimal digit and that the set of Keith numbers has density zero. (en)
Title
  • Counting Keith numbers (article 07.2.2)
  • Counting Keith numbers (article 07.2.2) (en)
  • Počítání Keithových čísel (cs)
skos:prefLabel
  • Counting Keith numbers (article 07.2.2)
  • Counting Keith numbers (article 07.2.2) (en)
  • Počítání Keithových čísel (cs)
skos:notation
  • RIV/00216208:11320/07:00005000!RIV08-MSM-11320___
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  • Counting; Keith; numbers; article (en)
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  • Journal of Integer Sequences
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  • Klazar, Martin
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