%I
%S 4,6,9,15,25,35,49,77,91,121,143,169,187,209,221,247,289,299,323,361,
%T 391,437,493,527,529,551,589,667,703,713,841,851,899,943,961,989,1073,
%U 1147,1189,1247,1271,1333,1363,1369,1457,1517,1537,1591,1643,1681
%N Semiprimes with greater factor less than twice the smaller factor.
%C A084127(a(n)) < A084126(a(n))*2; subsequence of A001358; A001248 is a subsequence.
%C Odd composite integers which do not have a representation as the sum of an even number of consecutive integers. For instance, 27 is not in the sequence because it has a representation as the sum of an even number of consecutive integers (2+3+4+5+6+7). 35 is in the sequence because it does not have such a representation.  _Andrew Plewe_, May 14 2007
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Semiprime.html">Semiprime</a>
%e 35=5*7 is a term, as 7<5*2=10;
%e 21=3*7 is not a term, as 7>3*2=6.
%K nonn
%O 1,1
%A _Reinhard Zumkeller_, Sep 29 2003
