**Numbers n such that at least one of n and n+2 is composite while for every b relatively prime to n*(n+2), b^(n-1)==1 mod n and b^(n+1)==1 mod n+2.**

*561, 1103, 2465, 2819, 6599, 29339, 41039, 52631, 62743, 172079, 188459, 278543*

*2 seqfan posts*

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

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