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Numbers n such that reversal(n^n) is prime.
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%I #20 Aug 17 2020 11:00:55

%S 8,5569,34351

%N Numbers n such that reversal(n^n) is prime.

%C The numbers corresponding to the second and third terms are probable primes.

%C a(3) > 26580. - _Giovanni Resta_, Mar 01 2013

%C a(4) > 43200 according to Thomas Ritschel (2013). - _M. F. Hasler_, Oct 31 2014

%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_653.htm">Puzzle 653</a>, published in (Aug./Sep.?) 2012, answers added between March and October 2013; The Prime Puzzles and Problems Connection.

%Y Cf. A004086.

%K nonn,base,bref,hard,more

%O 1,1

%A _Farideh Firoozbakht_, Jun 16 2010

%E a(3) from Thomas Ritschel (2013), added by _Arkadiusz Wesolowski_, Oct 30 2014