How many pairs (r, r+1) have one or more prime factors common…

How many pairs (r, r+1) have one or more prime factors common, where r is an integer and 2 ≤ r ≤9 ?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #92786

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