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Aliquot sequencePerfect numberDivisor summatory functionDivisor functionMultiplicative functionPractical numberPartitionSylvester's sequencePerfect totient numberGreatest common divisorFundamental theorem of arithmeticMultiplicative orderCompositionSum-product numberDigit sumInteger factorizationAbundant numberSum of two squares theoremNumber theoryHyperperfect numberP-adic valuationInteger complexityEuclid numberAlgebraic number theoryEuler's totient functionInteger square rootRational numberPrime number theoremSociable numberHarmonic numberMagic squareDivisorFermat's little theoremChen's theoremCyclotomic polynomialDivisibility sequenceTriangular numberAlgebraic numberNumber-theoretic functionComposite numberFermat polygonal number theoremCoprime integersPrimes in arithmetic progressionEuler's criterionFourth powerAlgebraic integerAdditive number theoryPartial sumSpecial number field sieveLeast common multipleInteger factorization recordsHarshad numberMultinomial theoremDirichlet seriesSummationAmicable numberTotal ring of fractionsSquared triangular numberPisano periodPrime-counting functionSemiprimeDouble factorialLegendre's formulaSquare triangular numberDegree of a polynomialNatural densityAlgebraic fractionTotientQuotientQuadratic reciprocitySuperparticular numberRamanujan's sumTriangle inequalityFarey sequenceClass number formulaEuler productLegendre's three-square theoremPrimitive root modulo nModular multiplicative inversePerfect powerDeficient numberLiouville numberSquare numberAnalytic number theoryHarmonic seriesRing of integersQuadratic residueGeometry of numbersStirling number of the second kindArithmetic seriesEuclidean divisionPythagorean trigonometric identitySemisimple lie algebraProth numberPrime factorizationCardinalityBrahmagupta's identitySuperior highly composite numberFibonacci sequenceCongruent number