EntityQ1418543· pop 9· linked from 219 articlesGiuga numberSign in to savecomposite number n such that p divides n/p − 1 for every prime divisor p of nConnectionsprime numberEntityfigurate numberEntityautomorphic numberEntityInternational Standard Book NumberEntitynatural numberEntitynumber theoryEntitydigital object identifierEntitydigitEntitybinary numeral systemEntityexponentiationEntitynumeral systemEntitythree-dimensional spaceEntitynatural languageEntitycomposite numberEntityperfect numberEntitydivisorEntitypermutationEntityJSTOREntityrecursionEntitysorting algorithmEntityCategoriesInteger sequencesUnsolved problems in number theory