**a(n) = the largest prime p < p(n) such that p(n) - p is squarefree, where p(n) is the n-th prime. a(n) = 0 if no such prime p exists.**

*2, 3, 5, 5, 11, 11, 17, 17, 23, 29, 31, 31, 41, 41, 47, 53, 59, 61, 61, 71, 73, 73, 83, 83*

*2 seqfan posts*

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

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