%I A055561
%S A055561 75,363,609,867,1183,1265,1275,1491,1587,1725,1805,2067,2175,2373,2523,
%T A055561 3045,3525,3685,3795,3975,4137,4205,4335,4425,4895,5019,5043,5109,5901,
%U A055561 5915,6171,6225,6627,6675,6699,7935,8025,8427,8475,8855,9429,9537,10275
%N A055561 Numbers n such that there are precisely 3 groups of order n.
%D A055561 Hans Ulrich Besche, Bettina Eick, E. A. O'Brien, A Millenium Project: 
               Constructing Small Groups, International Journal of Algebra and Computation, 
               Vol. 12, No 5 (2002), 623-644.
%H A055561 H.-U. Besche, <a href="http://www-public.tu-bs.de:8080/~hubesche/small.html">
               The Small Groups library</a>
%H A055561 Gordon Royle, <a href="http://www.cs.uwa.edu.au/~gordon/remote/group1000.html">
               Numbers of Small Groups</a>
%Y A055561 Cf. A000001, A003277, A054395-A054397.
%Y A055561 Sequence in context: A098230 A158742 A158765 this_sequence A015223 A129625 
               A133382
%Y A055561 Adjacent sequences: A055558 A055559 A055560 this_sequence A055562 A055563 
               A055564
%K A055561 nonn
%O A055561 1,1
%A A055561 Christian G. Bower (bowerc(AT)usa.net), May 25 2000; Nov 12 2003; Feb 
               17 2006