Zhongxian Huang
Abstract
There are no integers n with ω(n)=3,2n,n≠2~αpq(α∈N) such that σ(n)=kφ(n),where k≤4 and k∈N,p,q are distinct odd primes.
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There are no integers n with ω(n)=3,2n,n≠2~αpq(α∈N) such that σ(n)=kφ(n),where k≤4 and k∈N,p,q are distinct odd primes.
Key concepts: Divisibility rule, Arithmetic, Relation (database), Mathematics, Mental arithmetic, Pure mathematics, Computer science, Database