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 A029566 #14 May 21 2013 11:13:09
%S A029566 148219,287274,3543794,38718219,142500794,211860799,293790169,
%T A029566 378321938,552333594,850684829,1033256883,1454938619,1464112007,
%U A029566 1493284930,1848698699,2692083869,3183401369,3428629709,3447827069
%N A029566 Quasi-Carmichael numbers to base -6: squarefree composites n such that prime p|n ==> p+6|n+6.
%H A029566 Giovanni Resta, <a href="/A029566/b029566.txt">Table of n, a(n) for n = 1..93</a> (terms < 5*10^12)
%H A029566 <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers.</a>
%t A029566 qcp[n_, d_] := Block[{p, e}, {p, e} = Transpose@FactorInteger@n;
%t A029566 Length[p] > 1 && Max[e] == 1 && And @@ IntegerQ /@ ((n + d)/(p + d))]; Select[Range[10^6], qcp[#, 6] &] (* _Giovanni Resta_, May 21 2013 *)
%K A029566 nonn
%O A029566 1,1
%A A029566 _David W. Wilson_