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Partially supported by an NSF grant. On leave from the University of Georgia.
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Erdős, P., Pomerance, C. & Sárközy, A. On locally repeated values of certain arithmetic functions. II. Acta Math Hung 49, 251–259 (1987). https://doi.org/10.1007/BF01956329
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DOI: https://doi.org/10.1007/BF01956329