Search: id:A051887
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%I A051887
%S A051887 2,2,2,2,2,5,17,11,11,11,2,23,7,43,19,3,5,2,7,3,61,53,2,41,47,2
%N A051887 Minimal and special 2k-Germain primes, where 2k is A002110, primorial 
               number.
%C A051887 Minimal p sequence so that primorial*p+1 is also prime.
%C A051887 While p is in A005384, the Q(n)p+1 primes are in A005385(primorial-safe 
               primes)
%F A051887 Analogous to or subset of A051686, where the even numbers are: 2, 6, 
               ..., A002110(n), ...
%e A051887 a(25) is 47 because Q(25)*47+1 is also prime and minimal with this property: 
               Q(25)*47+1=47*2305567963945518424753102147331756070+1 =108361694305439365963395800924592535291 
               is a minimal prime. The first 6 terms (2,2,2,2,2,5) correspond to 
               first entries in A005384, A007693, A051645, A051647, A051653, A051654 
               respectively.
%Y A051887 A002110, A005384, A005385, A051686, A007693, A051886, A051888.
%Y A051887 Sequence in context: A162487 A115101 A023569 this_sequence A139516 A160762 
               A112968
%Y A051887 Adjacent sequences: A051884 A051885 A051886 this_sequence A051888 A051889 
               A051890
%K A051887 nonn
%O A051887 1,1
%A A051887 Labos E. (labos(AT)ana.sote.hu), Dec 15 1999

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