%I A125722
%S A125722 0,20,630,13120,224120,3420020,48460020,651939020,8439739020
%N A125722 Greatest product of two numbers made up together of digits 0 to n once.
%e A125722 The greatest product of two numbers using digits 0 through 7,for instance,
               occurs when the difference between them is least,(since X*Y={(X+Y)^2 
               - (X-Y)^2}/4),i.e., when the product equals 7420*6531=48640020=a(7).
%Y A125722 Sequence in context: A015268 A059420 A129906 this_sequence A006410 A159874 
               A109894
%Y A125722 Adjacent sequences: A125719 A125720 A125721 this_sequence A125723 A125724 
               A125725
%K A125722 fini,full,nonn
%O A125722 1,2
%A A125722 Lekraj Beedassy (blekraj(AT)yahoo.com), Feb 01 2007