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A178329 Numbers n such that reversal(n^n) is prime. 0
8, 5569, 34351 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
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
LINKS
Carlos Rivera, Puzzle 653, published in (Aug./Sep.?) 2012, answers added between March and October 2013; The Prime Puzzles and Problems Connection.
CROSSREFS
Cf. A004086.
Sequence in context: A340890 A093937 A318897 * A062030 A052497 A304426
KEYWORD
nonn,base,bref,hard,more
AUTHOR
Farideh Firoozbakht, Jun 16 2010
EXTENSIONS
a(3) from Thomas Ritschel (2013), added by Arkadiusz Wesolowski, Oct 30 2014
STATUS
approved

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Last modified June 18 21:09 EDT 2024. Contains 373487 sequences. (Running on oeis4.)