Smallest positive composite number, relatively prime to n, such that a(n)+n is also composite.
8, 25, 22, 21, 4, 49, 8, 25, 16, 39, 4, 65, 8, 25, 34, 9, 4, 77, 6, 49, 4, 27, 4, 25, 8, 9, 8
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