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- Almost_perfect_number abstract "In mathematics, an almost perfect number (sometimes also called slightly defective or least deficient number) is a natural number n such that the sum of all divisors of n (the sum-of-divisors function σ(n)) is equal to 2n − 1, the sum of all proper divisors of n, s(n) = σ(n) − n, then being equal to n − 1. The only known almost perfect numbers are powers of 2 with non-negative exponents (sequence A000079 in OEIS). Therefore the only known odd almost perfect number is 20 = 1, and the only known even almost perfect numbers are those of the form 2k for some positive number k; however, it has not been shown that all almost perfect numbers are of this form. It is known that an odd almost perfect number greater than 1 would have at least 6 prime factors.If m is an odd almost perfect number then m(2m−1) is a Descartes number.".
- Almost_perfect_number wikiPageID "322008".
- Almost_perfect_number wikiPageRevisionID "606066219".
- Almost_perfect_number hasPhotoCollection Almost_perfect_number.
- Almost_perfect_number title "Almost perfect number".
- Almost_perfect_number urlname "AlmostPerfectNumber".
- Almost_perfect_number subject Category:Divisor_function.
- Almost_perfect_number subject Category:Integer_sequences.
- Almost_perfect_number type Abstraction100002137.
- Almost_perfect_number type Arrangement107938773.
- Almost_perfect_number type Group100031264.
- Almost_perfect_number type IntegerSequences.
- Almost_perfect_number type Ordering108456993.
- Almost_perfect_number type Sequence108459252.
- Almost_perfect_number type Series108457976.
- Almost_perfect_number comment "In mathematics, an almost perfect number (sometimes also called slightly defective or least deficient number) is a natural number n such that the sum of all divisors of n (the sum-of-divisors function σ(n)) is equal to 2n − 1, the sum of all proper divisors of n, s(n) = σ(n) − n, then being equal to n − 1. The only known almost perfect numbers are powers of 2 with non-negative exponents (sequence A000079 in OEIS).".
- Almost_perfect_number label "Almost perfect number".
- Almost_perfect_number label "Bijna perfect getal".
- Almost_perfect_number label "Nombre presque parfait".
- Almost_perfect_number label "Numero lievemente difettivo".
- Almost_perfect_number label "Número casi perfecto".
- Almost_perfect_number label "Слегка недостаточные числа".
- Almost_perfect_number label "殆完全數".
- Almost_perfect_number sameAs Número_casi_perfecto.
- Almost_perfect_number sameAs Nombre_presque_parfait.
- Almost_perfect_number sameAs Bilangan_hampir_sempurna.
- Almost_perfect_number sameAs Numero_lievemente_difettivo.
- Almost_perfect_number sameAs Bijna_perfect_getal.
- Almost_perfect_number sameAs m.01vmvm.
- Almost_perfect_number sameAs Q1526045.
- Almost_perfect_number sameAs Q1526045.
- Almost_perfect_number sameAs Almost_perfect_number.
- Almost_perfect_number wasDerivedFrom Almost_perfect_number?oldid=606066219.
- Almost_perfect_number isPrimaryTopicOf Almost_perfect_number.