This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A122984 #2 Mar 30 2012 17:35:16 %S A122984 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, %T A122984 27,4,91,4,25,16,15,4,49,8,25,10,9,4,143,6,21,4,9,4,77,6,27,4,25,4,65, %U A122984 8,9,8,27,4,143,4,15,22,21,4,25,8,9,8,51,4,49,4,21,16,9,4,55,6,39,4,9,4,85 %N A122984 Smallest positive composite number, relatively prime to n, such that a(n)+n is also composite. %C A122984 Does not include every composite number; in particular, 12 is not present. If a(n) = 12, gcd(n,12) = 1, but then one of n+4 and n+8 is divisible by 3. %Y A122984 Equals A122985(n) - n. Cf. A096076. %K A122984 easy,nonn %O A122984 1,1 %A A122984 _Franklin T. Adams-Watters_, Sep 22 2006