%I A057103
%S A057103 24,96,120,240,384,336,480,840,960,720,840,1536,1944,1920,1320,1344,
%T A057103 2520,3360,3696,3360,2184,2016,3840,5280,6144,6240,5376,3360,2880,5544,
%U A057103 7776,9360,10080,9720,8064,4896,3960,7680,10920,13440,15000,15360
%N A057103 Triangle of congrua: T(n,k)=4nk(n^2-k^2) with n>k>0 and starting at T(2,
               1)=24. A055096(n)^2+a(n) is a square, as is A055096(n)^2-a(n).
%H A057103 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CongruumProblem.html">Link to a section of The World of Mathematics.</
               a>
%e A057103 a(1)=T(2,1)=4*2*1*(4-1)=5^2-1^2=7^2-5^2=24
%Y A057103 Cf. possible congrua A057102. See also A055096.
%Y A057103 Sequence in context: A090214 A103251 A057102 this_sequence A055669 A042122 
               A042124
%Y A057103 Adjacent sequences: A057100 A057101 A057102 this_sequence A057104 A057105 
               A057106
%K A057103 nonn,tabl
%O A057103 1,1
%A A057103 Henry Bottomley (se16(AT)btinternet.com), Aug 02 2000