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EXAMPLE
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a[1]=a[2]=2 because they generate {2,3,7,43,13,...};
a[3]=19 because it generates {19,2,3,5,571,271,..}, see A051312;
a[4]=199 because it generates {199,2,3,5,7,881,..};
a[5]=2089 because it generates {2089,2,3,5,7,11,269,..};
a[6]=99019 because it generates {99089,2,3,5,7,11,13,2976243271,..};
a[7]=1960969 because it generates {1960969,2,3,5,7,11,13,17,281,47,419,5539788476533581271,37,19,73,..}
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