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A178329
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Numbers n such that reversal(n^n) is prime.
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0
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OFFSET
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1,1
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COMMENTS
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The numbers corresponding to the second and third terms are probable primes.
a(3) > 26580. - Giovanni Resta, Mar 01 2013
a(4) > 43200 according to Thomas Ritschel (2013). - M. F. Hasler, Oct 31 2014
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LINKS
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Table of n, a(n) for n=1..3.
Carlos Rivera, Puzzle 653, published in (Aug./Sep.?) 2012, answers added between March and October 2013; The Prime Puzzles and Problems Connection.
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CROSSREFS
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Cf. A004086.
Sequence in context: A340890 A093937 A318897 * A062030 A052497 A304426
Adjacent sequences: A178326 A178327 A178328 * A178330 A178331 A178332
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KEYWORD
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nonn,base,bref,hard,more
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AUTHOR
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Farideh Firoozbakht, Jun 16 2010
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EXTENSIONS
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a(3) from Thomas Ritschel (2013), added by Arkadiusz Wesolowski, Oct 30 2014
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STATUS
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approved
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