Search: id:A027568
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%I A027568
%S A027568 0,1,10,120,1540,7140
%N A027568 Numbers that are both triangular and tetrahedral.
%D A027568 Avanesov, E. T.; Solution of a problem on figurate numbers. (Russian) 
               Acta Arith. 12 1966/1967 409-420.
%D A027568 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 10, p. 3 ; Entry 
               119, p. 41, Ellipses, Paris 2008.
%D A027568 L. J. Mordell, Diophantine Equations, Ac. Press, p. 258.
%H A027568 P. De Geest, <a href="http://www.worldofnumbers.com/tetra.htm">Palindromic 
               Tetrahedrals</a>
%H A027568 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TetrahedralNumber.html">More information</a>
%p A027568 {seq(binomial(i,3),i=0..100000) } intersect {seq(binomial(k,2), k= 0..100000)}; 
               - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 26 2008
%Y A027568 Intersection of A000217 and A000292. Cf. A102349, A102461, A102772.
%Y A027568 Sequence in context: A069498 A024127 A005949 this_sequence A034255 A051582 
               A122420
%Y A027568 Adjacent sequences: A027565 A027566 A027567 this_sequence A027569 A027570 
               A027571
%K A027568 nonn,fini,full
%O A027568 1,3
%A A027568 Patrick De Geest (pdg(AT)worldofnumbers.com)

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