**a(n) = largest k such that prime(n+1) = prime(n) + (prime(n) mod k), or 0 if no such k exists.**

*0, 0, 3, 0, 9, 9, 15, 15, 17, 27, 25, 33, 39, 39, 41, 47, 57, 55, 63, 69, 67, 75, 77, 81, 93*

*1 seqfan posts*

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

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