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A136428
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First differences of A064770.
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2
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,10
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COMMENTS
| 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
| R. Zumkeller, Table of n, a(n) for n = 0..9999
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FORMULA
| 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
| Sequence in context: A157307 A036949 A059515 * A194655 A197037 A179376
Adjacent sequences: A136425 A136426 A136427 * A136429 A136430 A136431
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KEYWORD
| sign
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 30 2007
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