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A102967
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Numbers n such that 3*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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OFFSET
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1,2
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COMMENTS
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Also numbers n such that (29*10^n+43)/9 is prime.
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LINKS
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FORMULA
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MATHEMATICA
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Do[ If[ PrimeQ[(29*10^n+43)/9], Print[n]], {n, 0, 10000}]
Select[Range[5100], PrimeQ[(29 10^# + 43) / 9] &] (* Vincenzo Librandi, Mar 12 2015 *)
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PROG
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(Magma) [n: n in [0..1000] | IsPrime((29*10^n+43) div 9 )]; // Vincenzo Librandi, Mar 12 2015
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CROSSREFS
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KEYWORD
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bref,more,nonn
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AUTHOR
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STATUS
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approved
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