Search: id:A048744
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%I A048744
%S A048744 2,3,9,13,19,21,55,261,3415,4185,7353,12213,44169,60975,61011,108049,
%T A048744 182451,228271,481801,500899,505431
%N A048744 Numbers n such that 2^n - n is prime.
%D A048744 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 261, p. 70, Ellipses, 
               Paris 2008.
%H A048744 Henri Lifchitz, Renaud Lifchitz, <a href="http://www.primenumbers.net/
               prptop/searchform.php?form=2%5En-n">PRP Top Records.</a> 2^n-n.
%e A048744 2^55 - 55 = 36028797018963913 is prime.
%t A048744 Do[ If[ PrimeQ[ 2^n - n ], Print[ n ] ], {n, 0, 7353} ]
%Y A048744 Cf. A000325, A081296, A052007.
%Y A048744 Sequence in context: A155929 A032486 A123859 this_sequence A057293 A109662 
               A116222
%Y A048744 Adjacent sequences: A048741 A048742 A048743 this_sequence A048745 A048746 
               A048747
%K A048744 nonn,nice,hard
%O A048744 1,1
%A A048744 G. L. Honaker, Jr. (honak3r(AT)gmail.com)
%E A048744 261 and 3415 found by Warut Roonguthai (warut822(AT)yahoo.com)
%E A048744 4185 and 7353 are probable primes (the latter was found by Jud McCranie).
%E A048744 12213 found by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 02 2001.
%E A048744 More terms from Henri Lifchitz contributed by Ray Chandler (rayjchandler(AT)sbcglobal.net), 
               Mar 02 2007
%E A048744 Edited by T. D. Noe (noe(AT)sspectra.com), Oct 30 2008

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