%I #8 Sep 18 2022 11:38:54
%S 4,27,119,497,2023,8149,32692,130938,524050,2096730,8387859,33553102,
%T 134215364,536866711,2147476180,8589921317,34359714770,137438911520,
%U 549755739309,2199023122967,8796092786503,35184371669802,140737487610388,562949952096975
%N Bisection of A013697.
%F a(n) = floor(1/(zeta(2n+1)-1)).
%K nonn
%O 1,1
%A _N. J. A. Sloane_, May 13 2011