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Search: id:A071859
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| A071859 |
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Determinant of M_n where M_n is the n X n matrix m_(i,j) = A010060(i+j). |
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+0
1
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| 0, 0, -1, 1, 1, -1, 0, 0, 1, 1, -1, -1, 0, 0, -1, 1, 1, 1, -2, 2, 3, -3, -1, 1, -2, -2, 1, 1, 1, -1, 0, 0, 1, 1, -1, 1, 2, -2, -1, -1, 3, 3, -2, -2, -1, 1, -1, -1, 0, 0, 1, -1, -1, 1, 0, 0, 1, 1, -1, -1, 0, 0, -1, 1, 1, 1, -2, 2, 3
(list; graph; listen)
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OFFSET
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1,19
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COMMENT
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a(n)=0 for n=1,2,7,8,13,14,31,32,49,50,55,56,61,62...hence if a(n)=0, n odd it seems that a(n+1)=0. It seems also that if a(n)=0 (n odd ) then n == 1 mod 6 (converse doesn't hold).
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PROGRAM
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(PARI) for(n=1, 70, print1(matdet(matrix(n, n, i, j, length(binary(j+i))%2)), ", "))
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CROSSREFS
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Cf. A010060.
Sequence in context: A068460 A143797 A079729 this_sequence A105899 A135695 A071434
Adjacent sequences: A071856 A071857 A071858 this_sequence A071860 A071861 A071862
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KEYWORD
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easy,more,sign
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 09 2002
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