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Search: id:A136428
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| 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, 67, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0
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OFFSET
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0,10
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COMMENT
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a(10*n+k) = 0 for k = 1, 2, 4, 5, 6, 7;
a(10*n+k) = 1 for k = 0, 3, 8;
a(100*n+10*k+9) = -3 for k = 1, 2, 4, 5, 6, 7;
a(100*n+10*k+9) = 7 for k = 0, 3, 8;
a(1000*n+100*k+99) = -33 for k = 1, 2, 4, 5, 6, 7;
a(1000*n+100*k+99) = 67 for k = 0, 3, 8.
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LINKS
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R. Zumkeller, Table of n, a(n) for n = 0..9999
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FORMULA
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a(n) = (2*A010052(m mod 10) - 1)*rounded(((1+A010052(m mod 10))*10^k)/3) where n = m*10^k - 1 with m mod 10 > 0.
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CROSSREFS
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Sequence in context: A024094 A036949 A059515 this_sequence A053878 A070672 A055061
Adjacent sequences: A136425 A136426 A136427 this_sequence A136429 A136430 A136431
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KEYWORD
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sign
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 30 2007
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