Search: id:A117360
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%I A117360
%S A117360 2,3,4,5,10,11,23,25,29,34,38,40,41,46,52,53,55,57,76,77,83,89,91,93,
%T A117360 106,113,118,123,129,130,131,133,143,145,159,161,169,171,172,173,177,
%U A117360 179,185,191,201,203,205,206,212,213,218,220,226,233,235,238,239,251
%N A117360 Numbers m such that m and 2*m+1 have the same number of prime factors.
%C A117360 A001222(a(n)) = A001222(2*a(n)+1);
%C A117360 Sophie Germaine primes are a subsequence, see A005384.
%H A117360 R. Zumkeller, <a href="b117360.txt">Table of n, a(n) for n = 1..10000</
               a> [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 
               08 2009]
%e A117360 m=52=2*2*13, 2*52+1=105=3*5*7, therefore 52 is a term.
%Y A117360 Sequence in context: A032884 A023787 A032983 this_sequence A074821 A076707 
               A032940
%Y A117360 Adjacent sequences: A117357 A117358 A117359 this_sequence A117361 A117362 
               A117363
%K A117360 nonn
%O A117360 1,1
%A A117360 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 10 2006

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