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A131036
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First differences of A131711.
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0
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1, 1, 3, -3, 7, -9, 9, -1, -3, 3, -7, -1, 1, 1, 3, -3, 7, -9, 9, -1, -3, 3, -7, -1, 1, 1, 3, -3, 7, -9, 9, -1, -3, 3, -7, -1, 1, 1, 3, -3, 7, -9, 9, -1, -3, 3, -7, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The equivalent operation on A001333 yields last digits A131707 and their first differences A131715.
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FORMULA
| a(n)=a(n-12).
a(n)=(1/6)*{-(n mod 12)-3*[(n+1) mod 12]+5*[(n+2) mod 12]-3*[(n+3) mod 12]+[(n+4) mod 12]+5*[(n+5) mod 12]-9*[(n+6) mod 12]+8*[(n+7) mod 12]-5*[(n+8) mod 12]+3*[(n+9) mod 12]-[(n+10) mod 12]}, with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Jul 03 2008
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CROSSREFS
| Sequence in context: A144554 A177936 A143088 * A034411 A066983 A048240
Adjacent sequences: A131033 A131034 A131035 * A131037 A131038 A131039
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KEYWORD
| sign
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Sep 23 2007
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EXTENSIONS
| Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 07 2008
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