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arxiv: 0806.1001 · v2 · pith:JILIRBU2new · submitted 2008-06-05 · 🧮 math.NT · math.GM

Does Ten Have a Friend?

classification 🧮 math.NT math.GM
keywords primecongruentfactorsleastmodulomustabundancyappear
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Any positive integer $n$ other than 10 with abundancy index 9/5 must be a square with at least 6 distinct prime factors, the smallest being 5. Further, at least one of the prime factors must be congruent to 1 modulo 3 and appear with an exponent congruent to 2 modulo 6 in the prime power factorization of $n$.

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