%I A117746
%S A117746 1,5,29,41,131,155,209,379,461,551,649,991,1055,1121,1189,1639,1721,
%T A117746 1891,2351,2449,2755,3079,3305,3781,4159,4421,4555,5699,5851,6005,6319,
%U A117746 6805,7309,7831,8371,9505,10099,10301,10505,12431,12655,13339,14761
%N A117746 Numbers of the form n^2-n-1 for which the sum of the digits is also a 
               number of the form n^2-n-1.
%e A117746 5699 is in the sequence because (1)5699=76^2-76-1, (2)the sum of its 
               digits is 5+6+9+9=29 and (3)29 can be written as 6^2-6-1
%Y A117746 Sequence in context: A033205 A167742 A107151 this_sequence A156053 A081116 
               A146829
%Y A117746 Adjacent sequences: A117743 A117744 A117745 this_sequence A117747 A117748 
               A117749
%K A117746 base,nonn
%O A117746 1,2
%A A117746 Luc Stevens (lms022(AT)yahoo.com), Apr 14 2006