Least p with p, q both prime, such that p+2n = q.
3, 3, 5, 3, 3, 5, 3, 3, 5, 3, 7, 5, 3, 3, 7, 5, 3, 5, 3, 3, 5, 3, 7, 5, 3, 7, 5, 3, 3, 7, 5, 3, 5, 3
1 seqfan posts
Mon Jan 26 00:54:36 CET 2009 [seqfan] Re: Add n to the composite a(n): the result is a composite too