Search: id:A120226
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%I A120226
%S A120226 1,3,7,9,13,15,25,27,37,39,43,49,57,67,69,79,93,97,99,105,127,135,153,
%T A120226 163,169,175,177,189,193,207,219,235,253,265,267,273,277,279,303,307,
%U A120226 309,343,345,363,405,417,427,435,475,483,487,499,517,553,559,567,573
%N A120226 Numbers n such that a+n and a*n+1 are prime, case a=4.
%C A120226 Prime numbers p such that 4+p and 4*p+1 are prime A106057. Case a=5 A120227.
%t A120226 Reap[Do[Do[If[PrimeQ[{n+x, n*x+1}]=={True,True},Sow[x]],{x,1,1000,2}],
               {n,4,4}]][[2,1]]
%Y A120226 Cf. A092945, A106057 A085063, A120223, A120224, A120225, A120227.
%Y A120226 Sequence in context: A073671 A024901 A000959 this_sequence A137310 A118567 
               A118561
%Y A120226 Adjacent sequences: A120223 A120224 A120225 this_sequence A120227 A120228 
               A120229
%K A120226 nonn
%O A120226 1,2
%A A120226 Zak Seidov (zakseidov(AT)yahoo.com), Jun 10 2006

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