%I #6 Feb 24 2021 08:38:35
%S 1,2,3,3,3,3,10,19,27,32,41,209,351,809,1235,3337,4109,43834
%N Engel expansion of the Madelung constant A085469.
%H Simon Plouffe, <a href="http://wayback.cecm.sfu.ca/projects/ISC/ISCmain.html">Plouffe's Inverter </a> lookup on 1.747564594633182
%e 1 +1/2 +1/(2*3) +1/(2*3*3) + 1/(2*3*3*3) + 1/(2*3*3*3*3) + 1/(2*3*3*3*3*10)+.... = 1.74756...
%K nonn
%O 1,2
%A _Gerald McGarvey_, Jul 25 2004