MathSciNet bibliographic data MR582925 (81j:10002) 10A20 Cohen, G. L.; Hagis, P., Jr. On the number of prime factors of $n$$n$ if $\varphi (n)(n-1)$$\varphi (n)(n-1)$. Nieuw Arch. Wisk. (3) 28 (1980), no. 2, 177–185. Links to the journal or article are not yet available

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