%I #8 Sep 06 2014 00:19:38
%S 2,5,11,23,47,283,719,1439,2879,34549,138197,1266767,4782969,14348907
%N Smallest k such that 4^^n is not congruent to 4^^(n-1) mod k, where 4^^n denotes the power tower 4^4^...^4 (in which 4 appears n times).
%C For general remarks regarding sequences of this type, see A246491.
%o (Sage, cython) Use linked source from A246491 with this command: find_k_values(4,1,1)
%Y Cf. A027763, A246491, A246493, A246494, A246495, A246496, A246497
%K nonn,more
%O 1,1
%A _Wayne VanWeerthuizen_, Aug 27 2014