%I A012132
%S A012132 3,6,8,10,11,13,15,16,18,20,21,23,26,27,28,31,33,36,37,38,40,41,43,44,
%T A012132 45,46,48,49,51,52,53,54,55,56,57,58,59,61,62,63,64,66,67,68,71,73,74,
%U A012132 75,76,77,78,80,81,83,86,88,89,91,92,93
%N A012132 Numbers z such x(x+1)+y(y+1)=z(z+1) is solvable.
%C A012132 For n>1, A047219 is a subset of this sequence. This is because n^2+(n+1)^2 
               is divisible by 5 if n is (1 or 3) mod 5 (also see A027861). - Dmitry 
               Kamenetsky (dkamen(AT)rsise.anu.edu.au), Sep 02 2008
%D A012132 H. Finner and K. Strassburger, Increasing sample sizes do not necessarily 
               increase the power of UMPU-tests for 2 X 2-tables. Metrika, 54, 77-91, 
               (2001).
%D A012132 Aviezri S. Fraenkel, Diophantine equations involving generalized triangular 
               and tetrahedral numbers, pp. 99-114 of A. O. L. Atkin and B. J. Birch, 
               editors, Computers in Number Theory. Academic Press, NY, 1971.
%D A012132 H. Harborth, Fermat-like binomial equations, Applications of Fibonacci 
               numbers, Proc. 2nd Int. Conf., San Jose/Ca., August 1986, 1-5 (1988).
%Y A012132 Complement of A027861 - Michael Somos, Jun 08, 2000.
%Y A012132 Cf. A047219, A027861.
%Y A012132 Sequence in context: A072960 A159264 A055073 this_sequence A108769 A112234 
               A023983
%Y A012132 Adjacent sequences: A012129 A012130 A012131 this_sequence A012133 A012134 
               A012135
%K A012132 nonn
%O A012132 1,1
%A A012132 sander(AT)win.tue.nl (Sander van Rijnswou)
%E A012132 More terms and references from Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), 
               Feb 09 2000