**a(n) = largest prime < p(n) such that p(n) - a(n) is a power of 2, where p(n) is the n-th prime; a(n) = 0 if no such prime exists.**

*2, 3, 5, 7, 11, 13, 17, 19, 13, 29, 29, 37, 41, 43, 37, 43, 59, 59, 67, 71, 71, 79, 73, 89*

*3 seqfan posts*

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

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