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 A054983 #14 Oct 15 2013 22:30:50
%S A054983 80,95,119,299,527,962,1247,1479,1739,2783,4307,4958,5240,6015,7878,
%T A054983 8342,10379,11639,16967,20687,21439,29294,34547,36917,49022,51959,
%U A054983 54707,59807,76127,97319,153242,181427,203318,203822,213419,363302,423999,494882,582902
%N A054983 Composite numbers n such that sigma(n+24) = sigma(n) + 24.
%C A054983 See also A015914, A054799, A033560
%H A054983 Donovan Johnson, <a href="/A054983/b054983.txt">Table of n, a(n) for n = 1..1000</a>
%e A054983 a(1) = 80, sigma(80)+24 = 186+24 = 210 = sigma(80+24) = sigma(104) = 104+52+26+13+8+4+2+1.
%t A054983 With[{nn=200000},Select[Complement[Range[nn],Prime[Range[ PrimePi[nn]]]], DivisorSigma[1,#+24] == DivisorSigma[1,#]+24&]] (* _Harvey P. Dale_, Jan 12 2013 *)
%Y A054983 Cf. A015914-A015917, A054799.
%K A054983 nonn
%O A054983 1,1
%A A054983 _Labos Elemer_, May 29 2000