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A236373
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Pseudoprimes to base 2 of the form 6p+1 such that 2^(p-1) == 1 (mod p).
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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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Composite 2^n-1 belong to this sequence when n is in A005385 (e.g., 2^83-1, 2^167-1, etc.)
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LINKS
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EXAMPLE
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2047=6*341+1; 2^2046 == 1 (mod 2047); 2^340 == 1 (mod 341).
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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