%I #8 Sep 06 2014 00:19:47
%S 3,7,19,47,243,719,1439,2879,19683,59049,177147,531441,1594323,4782969
%N Smallest k such that 5^^n is not congruent to 5^^(n-1) mod k, where 5^^n denotes the power tower 5^5^...^5 (in which 5 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(5,1,1)
%Y Cf. A027763, A246491, A246492, A246494, A246495, A246496, A246497
%K nonn,more
%O 1,1
%A _Wayne VanWeerthuizen_, Aug 27 2014