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 A287611 #10 May 31 2017 08:19:59 %S A287611 2,94,96,194,204,678,712,2310,7446 %N A287611 Numbers which are twice an Ulam number but not the sum of two distinct Ulam numbers. %C A287611 The sequence could also be described as numbers that have no representation as a sum of two distinct Ulam numbers, but have a "pseudo-representation" u + u, where u is an Ulam number. %C A287611 a(10), if it exists, is larger than 5*10^7. - _Giovanni Resta_, May 31 2017 %F A287611 a(n) = A285882(n)/2. - _Giovanni Resta_, May 31 2017 %e A287611 204 is in the sequence since it can't be written as the sum of two distinct Ulam numbers, but 204 = 102 + 102, where 102 is an Ulam number. %Y A287611 Cf. A002858, A285882. %K A287611 nonn,more %O A287611 1,1 %A A287611 _Enrique Navarrete_, May 27 2017