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7, 13, 73, 193, 241, 349, 409, 673, 769, 1201, 2089, 2689, 2713, 3109, 3169, 3181, 3361, 3433, 3529, 4057, 4129, 4153, 4201, 4561, 4801, 5281, 5581, 5641, 5821, 6133, 6421, 6469, 6529, 6709, 6841, 7561, 7753, 8161, 8929, 9241, 9601, 9697, 9769, 10321
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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2*3=6;3-2=1;6+1=7, 2*5=10;5-2=3;10-3=7,..
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LINKS
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MATHEMATICA
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lst={}; Do[pa=Prime[a]; Do[pb=Prime[b]; sp=pa*pb; dp=Abs[pa-pb]; If[PrimeQ[sp-dp]&&PrimeQ[sp+dp], AppendTo[lst, sp-dp]], {b, a+1, 6!}], {a, 6!}]; lst1=Union@lst; lst={}; Do[pa=Prime[a]; Do[pb=Prime[b]; sp=pa*pb; dp=Abs[pa-pb]; If[PrimeQ[sp-dp]&&PrimeQ[sp+dp], AppendTo[lst, sp+dp]], {b, a+1, 6!}], {a, 6!}]; lst2=Union@lst; Intersection[lst1, lst2]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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