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%I #19 Mar 06 2017 12:27:29
%S 2,3,7,7,25,25,49,49,49,49,49,49,81,81,81,81,241,241,289,289,289,289,
%T 289,289,289,289,289,289,289,289,721,721,721,721,721,721,961,961,961,
%U 961,961,961
%N Smallest k such that k^i - 1 is a totient number (A002202) for all i = 1 to n, or 0 if no such k exists.
%e a(3) = 7 because 7 - 1 = 6, 7^2 - 1 = 48, 7^3 - 1 = 342 are all totient numbers and 7 is the least number with this property.
%Y Cf. A000010, A002202, A045542.
%K nonn,more
%O 1,1
%A _Altug Alkan_, Feb 01 2017
%E a(18)-a(42) from _Max Alekseyev_, Feb 07 2017, Mar 06 2017
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