Search: id:A075712
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%I A075712
%S A075712 2,5,11,23,47,3,7,13,17,19,29,59,31,37,41,83,167,43,53,107,61,67,71,73,
%T A075712 79,89,179,359,719,1439,2879,97,101,103,109,113,227,127,131,263,137,
%U A075712 139
%N A075712 Rearrangement of primes into Germain groups.
%C A075712 In each group p(i+1) = 2*p(i)+1: {2, 5, 11, 23, 47}, {3, 7}, {13}, {17}, 
               {19}, {29, 59}, {31}, {37}, {41, 83, 167}, {43},{53, 107}, {61}, 
               {67}, {71}, {73}, {79}, {89, 179, 359, 719, 1439, 2879}, {97}, {101}, 
               {103}, {109}, {113, 227}, {127}, {131, 263}, {137}, {139}. By the 
               way, it is a question whether the group with one prime is a Germain 
               group. What i call here Germain group is also known as Cunningham 
               chain of the first kind, A059452, A059453, A059455, A059456, A053176.
%e A075712 First three Germain groups are: {2, 5, 11, 23, 47}, {3, 7}, {13}.
%Y A075712 Cf. A005384, A059452, A059453, A059455, A059456, A053176.
%Y A075712 Sequence in context: A147878 A140992 A093053 this_sequence A000100 A083005 
               A133489
%Y A075712 Adjacent sequences: A075709 A075710 A075711 this_sequence A075713 A075714 
               A075715
%K A075712 nonn,tabf
%O A075712 1,1
%A A075712 Zak Seidov (zakseidov(AT)yahoo.com), Oct 03 2002

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