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T. D. Noe found that 2789 is the smallest prime that does
not divide any term of the Lucas 4step sequence, i.e., Tetranacci numbers with different initial conditions: a(n)=a(n1)+a(n2)+a(n3)+a(n4), a(0)=4, a(1)=1, a(2)=3, a(4)=7. [Post]
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