EntityQ5043655· pop 6· linked from 7 articlesCarmichael's totient function conjectureSign in to savemathematics conceptConnectionsInternational Standard Book NumberEntitydigital object identifierEntitytheoremEntityJSTOREntitycoprimeEntityconjectureEntityEuler's totient functionEntityFermat numberEntityOn-Line Encyclopedia of Integer SequencesEntityWacław SierpińskiEntityMathWorldEntitySpringer Science+Business MediaEntityEric W. WeissteinEntityMathematical ReviewsEntityAnnals of MathematicsEntityRichard K. GuyEntityzbMATH OpenEntityupper and lower boundsEntityRobert Daniel CarmichaelEntityCarl PomeranceEntityCategoriesConjecturesMultiplicative functionsUnsolved problems in number theory