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 A029568 #14 May 21 2013 11:12:18
%S A029568 343027,387127,1344517,1430449,2125642,2383417,3537667,3542797,
%T A029568 5808067,7592577,7834042,7930117,9241627,12122947,15250942,21928717,
%U A029568 37908667,39355867,39627217,49825117,60738622,71092717,90640927,110995807
%N A029568 Quasi-Carmichael numbers to base -8: squarefree composites n such that prime p|n ==> p+8|n+8.
%H A029568 Giovanni Resta, <a href="/A029568/b029568.txt">Table of n, a(n) for n = 1..379</a> (terms < 10^12)
%H A029568 <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers.</a>
%t A029568 qcp[n_, d_] := Block[{p, e}, {p, e} = Transpose@FactorInteger@n;
%t A029568 Length[p] > 1 && Max[e] == 1 && And @@ IntegerQ /@ ((n + d)/(p + d))]; Select[Range[10^6], qcp[#, 8] &] (* _Giovanni Resta_, May 21 2013 *)
%K A029568 nonn
%O A029568 1,1
%A A029568 _David W. Wilson_