MathSciNet bibliographic data MR1689549 11N25 (11Y35) Graham, S. W.; Holt, Jeffrey J.; Pomerance, Carl On the solutions to $\phi(n)=\phi(n+k)$$\phi(n)=\phi(n+k)$. Number theory in progress, Vol. 2 (Zakopane-Kościelisko, 1997), 867–882, de Gruyter, Berlin, 1999. Links to the journal or article are not yet available

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