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%I #10 May 31 2017 08:19:59
%S 2,94,96,194,204,678,712,2310,7446
%N Numbers which are twice an Ulam number but not the sum of two distinct Ulam numbers.
%C 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 a(10), if it exists, is larger than 5*10^7. - _Giovanni Resta_, May 31 2017
%F a(n) = A285882(n)/2. - _Giovanni Resta_, May 31 2017
%e 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 Cf. A002858, A285882.
%K nonn,more
%O 1,1
%A _Enrique Navarrete_, May 27 2017