EntityQ839528· pop 10· linked from 226 articleshyperperfect numberSign in to savenatural number n for which the equality n=1+k(σ(n)−n−1) holds for some kConnectionsprime numberEntityfigurate numberEntitysociable numberEntityautomorphic numberEntityInternational Standard Book NumberEntitynatural numberEntityintegerEntitynumber theoryEntitydigital object identifierEntitydigitEntitybinary numeral systemEntityexponentiationEntitynumeral systemEntitythree-dimensional spaceEntityparityEntitynatural languageEntitycomposite numberEntityfundamental theorem of arithmeticEntityperfect numberEntitydivisorEntityCategoriesDivisor functionInteger sequencesPerfect numbers