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 A201186 #15 Jul 02 2015 02:41:03 %S A201186 6,28,496,8128,130816,2096128,33550336,536854528 %N A201186 Incorrect list of perfect numbers from Robert Recorde's Whetstone of Witte. %C A201186 In this list, only items 6, 28, 496, 8128 and 33550336 are perfect numbers. %D A201186 Jack Williams, Robert Recorde Tudor Polymath, Expositor and Practitioner of Computation, Springer, 2011, page 176. %H A201186 Robert Recorde, <a href="http://archive.org/details/TheWhetstoneOfWitte">The Whetstone of Witte</a>, whiche is the seconde parte of Arithmeteke: containing the extraction of rootes; the cossike practise, with the rule of equation; and the workes of Surde Nombers, London, 1557. See <a href="http://archive.org/stream/TheWhetstoneOfWitte#page/n23/mode/2up/">p. 24</a>. %Y A201186 Cf. A000396 (perfect numbers), A079598. %K A201186 nonn,fini,full %O A201186 1,1 %A A201186 _Olivier Gérard_, Nov 28 2011