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- Descartes_number abstract "In mathematics, a Descartes number is a number which is close to being a perfect number. They are named for René Descartes who observed that the number D = 32⋅72⋅112⋅132⋅22021 = 198585576189 would be an odd perfect number if only 22021 were a prime number, since the sum-of-divisors function for D satisfiesA Descartes number is defined as an odd number n = m⋅p where m and p are coprime and 2n = σ(m)⋅(p+1). The example given is the only one currently known.If m is an odd almost perfect number, that is, σ(m) = 2m−1, then m(2m−1) is a Descartes number.".
- Descartes_number wikiPageID "40093498".
- Descartes_number wikiPageRevisionID "568938863".
- Descartes_number subject Category:Divisor_function.
- Descartes_number subject Category:Integer_sequences.
- Descartes_number comment "In mathematics, a Descartes number is a number which is close to being a perfect number. They are named for René Descartes who observed that the number D = 32⋅72⋅112⋅132⋅22021 = 198585576189 would be an odd perfect number if only 22021 were a prime number, since the sum-of-divisors function for D satisfiesA Descartes number is defined as an odd number n = m⋅p where m and p are coprime and 2n = σ(m)⋅(p+1).".
- Descartes_number label "Descartes number".
- Descartes_number sameAs m.0wftqy3.
- Descartes_number sameAs Q15402251.
- Descartes_number sameAs Q15402251.
- Descartes_number wasDerivedFrom Descartes_number?oldid=568938863.
- Descartes_number isPrimaryTopicOf Descartes_number.