Search: id:A099439
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%I A099439
%S A099439 4,10,14,16,26,50,56,70,116,2072,6250,13670,14216,14626
%N A099439 Numbers n such that A000295(n)=2^n-n-1 is prime.
%C A099439 The next term is > 25000.
%C A099439 Equals A063791 + 1 - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 
               2008
%H A099439 <a href="http://groups.yahoo.com/group/primeform/">User group for PFGW 
               & PrimeForm programs.</a>
%e A099439 a(1)=4 because 2^4-4-1=11 is prime.
%Y A099439 Cf. A000295 2^n-n-1 (column 2 of the Eulerian numbers), A099440 primes 
               in A000295, A099441 2^n-n-1 is a semiprime, A099442 semiprimes in 
               A000295.
%Y A099439 Sequence in context: A114719 A116954 A102686 this_sequence A146763 A001581 
               A114335
%Y A099439 Adjacent sequences: A099436 A099437 A099438 this_sequence A099440 A099441 
               A099442
%K A099439 hard,nonn
%O A099439 1,1
%A A099439 Hugo Pfoertner (hugo(AT)pfoertner.org), Oct 18 2004

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