%I #28 Jul 24 2021 01:11:31
%S 432046225,631071001,4579461601,8494657921,53282340865,80601412609
%N Numbers k such that gcd(phi(k), k-1) > lambda(k)^2.
%C 2320690177 is the only 2 < k < 10^11 such that gcd(phi(k),k-1) = lambda(k)^2. - _Giovanni Resta_, Mar 24 2017
%Y Cf. A000010, A002322, A049559, A264012, A283656.
%K nonn,more
%O 1,1
%A _Thomas Ordowski_ and _Altug Alkan_, Mar 24 2017
%E a(3)-a(6) from _Giovanni Resta_, Mar 24 2017