%I A072724
%S A072724 1,4,8227,3427918353
%N A072724 Integers which are exactly the concatenation of the first m even numbers 
               (A019520) divided by their sum (A002378 = m^2+m).
%C A072724 A probability argument suggests that this sequence may be finite.
%e A072724 a(1) = 2/2 =1; a(2) = 24/(2+4) = 4; a(3) = 246810/(2+4+6+8+10) = 8227; 
               a(4) = 246810121416/(2+4+6+8+10+12+14+16).
%Y A072724 Cf. A067121, A072723, A072725.
%Y A072724 Sequence in context: A053951 A058460 A115050 this_sequence A116271 A058417 
               A151587
%Y A072724 Adjacent sequences: A072721 A072722 A072723 this_sequence A072725 A072726 
               A072727
%K A072724 base,nonn
%O A072724 1,2
%A A072724 Henry Bottomley (se16(AT)btinternet.com), Jul 06 2002