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A138601
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Numbers n such that 2^(2*n-37)-37 is prime.
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0
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20, 21, 24, 30, 66, 74, 390, 1194, 1244, 2166, 2580, 4488
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OFFSET
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1,1
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LINKS
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EXAMPLE
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2^(2*24-37)-37=2011, 2^(2*30-37)-37=8388571, 2^(2*66-37)-37=39614081257132168796771975131,...
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MATHEMATICA
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q=37; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^3}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
Select[Range[5000], PrimeQ[2^(2 # - 37) - 37] &] (* Harvey P. Dale, Dec 03 2021 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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