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A175171
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Primes p such that 3*2^p-1 is also prime
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0
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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For p=2, 3*2^2-1=11; p=3, 3*2^3-1=23; p=7, 3*2^7-1=383
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PROG
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(Magma) [p: p in PrimesUpTo(7000) | IsPrime(3*2^p-1) ]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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