%N Numbers k such that A033468(k) = A033468(k+1).
%C Are all terms odd?
%C Does the sequence have nonzero asymptotic density?
%H Robert Israel, <a href="/A330723/b330723.txt">Table of n, a(n) for n = 1..10000</a>
%e a(1) = 7 is in the sequence because A033468(7) = A033468(8) = 204425.
%p S:= 0: R:= NULL: count:= 0: t:= 0:
%p for i from 0 while count < 100 do
%p S:= S + 1/(i^2+1);
%p s:= t; t:= denom(S);
%p if s = t then R:= R, i-1; count:= count+1 fi
%Y Cf. A033468.
%A _Robert Israel_, Apr 27 2020