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Search: id:A130119
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| 9, 15, 5, 3, 3, 1, 15, 45, 1, 9, 3, 5, 15, 3, 1, 3, 45, 5, 9, 3, 1, 15, 15, 1, 3, 9, 5, 45, 3, 1, 3, 15, 5, 3, 9, 1, 45, 15, 1, 3, 3, 5, 15, 9, 1, 9, 15, 5, 3, 3, 1, 15, 45, 1, 9, 3, 5, 15, 3, 1, 3, 45, 5, 9, 3, 1, 15, 15, 1, 3, 9, 5, 45, 3, 1, 3, 15, 5, 3, 9, 1, 45, 15, 1, 3, 3, 5, 15, 9, 1, 9, 15, 5, 3, 3, 1, 15, 45, 1, 9, 3, 5, 15, 3, 1, 3, 45, 5, 9, 3, 1, 15
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n)=gcd((7n^2+2),(2n^2+7)).
Has period of length 45: 9,15,5,3,3,1,15,45,1,9,3,5,15,3,1,3,45,5,9,3,1,15,15,1,3,9,5,45,3,1,3,15,5,3,9,1,45,15,1,3,3,5,15,9,1.
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MATHEMATICA
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Table[GCD[n^2 - 19, 45], {n, 1, 100}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 17 2007
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CROSSREFS
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Sequence in context: A027009 A131224 A073920 this_sequence A058957 A136410 A066942
Adjacent sequences: A130116 A130117 A130118 this_sequence A130120 A130121 A130122
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), May 14 2007, corrected May 16 2007
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EXTENSIONS
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Better definition from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 17 2007
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