Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla An yi ƙoƙari a ƙoƙari na ƙaddamar da lambobi a cikin jerin Sylvester, amma yawancin ba a sani ba game da factorization.
Tabbas, wani nau'i mai rikitarwa na jumla shine "An yi ƙoƙari a ƙoƙarin ƙaddamar da waɗannan lambobi, amma yawancin ba a sani ba game da factorization; alal misali, ba a sani ba idan duk lambobi a cikin jerin suna squarefree, ko da yake duk sanannun sharuddan suna. "