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A128901
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Number of degree n polynomials over GF(2) (with nonzero constant term) at Hamming distance 1 from some irreducible polynomial.
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0
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0, 1, 2, 4, 8, 16, 32, 63, 128, 255, 510, 1020, 2032, 4048, 8109, 16216, 32434, 64731, 129597, 258718, 517424, 1034430, 2067780, 4132038, 8262934, 16515320, 33021972, 66029987, 132008983, 263944002, 527772375, 1055126462
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OFFSET
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1,3
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LINKS
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EXAMPLE
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The coefficient vectors of the two degree 3 irreducible polynomials are 1011 and 1101. They are at distance one from the two polynomials 1001 and 1111; thus a(3) = |{1001,1111}| = 2.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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