**As p runs through the primes, sequence gives denominator of Sum_{k=1..p-1} 1/k.**

*1, 2, 12, 20, 2520, 27720, 720720, 4084080, 5173168, 80313433200*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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