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%I #8 Mar 19 2020 08:24:33
%S 2,3,7,43,79,463,1277
%N Numbers k such that k^k - (k-1)^k is prime.
%C Each term of the sequence must be prime.
%H C. Rivera, <a href="https://www.primepuzzles.net/puzzles/puzz_185.htm">Puzzle 185</a>
%e 7 is in the sequence because 7^7 - 6^7 = 543607 is prime.
%o (PARI) isok(k) = ispseudoprime(k^k - (k-1)^k); \\ _Jinyuan Wang_, Mar 19 2020
%Y Cf. A072164, A072179, A073499.
%K nonn,more
%O 1,1
%A _Farideh Firoozbakht_, Jul 17 2003