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Search: id:A063671
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| A063671 |
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Positions of nonzero coefficients in cyclotomic polynomial Phi_n(x), A063670 in binary. |
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+0
5
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| 10, 11, 11, 111, 101, 11111, 111, 1111111, 10001, 1001001, 11111, 11111111111, 10101, 1111111111111, 1111111, 110111011, 100000001, 11111111111111111, 1001001, 1111111111111111111, 101010101, 1101101011011, 11111111111
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(0) could also be 1. - T. D. Noe, Oct 29 2007
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..300
Index entries for cyclotomic polynomials, positions of coefficients
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EXAMPLE
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E.g. Phi_15(x) = x^8 - x^7 + x^5 - x^4 + x^3 - x + 1, thus the 1-bits of a(15) are at positions 0,1,3,4,5,7 and 8, thus we get a(15) = 110111011
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MAPLE
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map(convert, A063670, binary);
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CROSSREFS
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Cf. A063672. A063671[n] = A063697[n] (the positive terms) + A063699[n] (the negative terms) (computed in any base, up to n=104).
Cf. A013595
Sequence in context: A008947 A108787 A097585 this_sequence A123895 A100830 A088475
Adjacent sequences: A063668 A063669 A063670 this_sequence A063672 A063673 A063674
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KEYWORD
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nonn,nice
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AUTHOR
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Antti Karttunen Aug 03 2001
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