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Search: id:A133485
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| A133485 |
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Integers n such that the polynomial x^(2n+2)+x+1 is primitive and irreducible over GF(2). |
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+0
1
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OFFSET
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1,2
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COMMENT
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An integer n>0 belongs to this sequence iff A100730(n)=2^(2n+3)-2. Alternatively, n belongs to this sequence iff 2n+2 belongs to A073639.
The polynomial x^(2n+2)+x+1 in the definition could be replaced by its reciprocal x^(2n+2)+x^(2n+1)+1.
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CROSSREFS
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Sequence in context: A101561 A047112 A032250 this_sequence A098425 A098408 A063564
Adjacent sequences: A133482 A133483 A133484 this_sequence A133486 A133487 A133488
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KEYWORD
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nonn,more,hard
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AUTHOR
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Max Alekseyev (maxal(AT)cs.ucsd.edu), Dec 02 2007, Feb 15 2008
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