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Search: id:A106481
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| A106481 |
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An Euler phi transform of 1/(1-x^2). |
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+0
1
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| 0, 1, 1, 3, 3, 7, 5, 13, 9, 19, 13, 29, 17, 41, 23, 49, 31, 65, 37, 83, 45, 95, 55, 117, 63, 137, 75, 155, 87, 183, 95, 213, 111, 233, 127, 257, 139, 293, 157, 317, 173, 357, 185, 399, 205, 423, 227, 469, 243, 511, 263, 543, 287, 595, 305, 635, 329, 671, 357, 729
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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a(2n)=A049690(n). a(2n+1)=A099957(n).
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FORMULA
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a(n)=sum{k=0..n, phi(n-k+1)*mod(k, 2)}
Euler transform of period 7 sequence [3,-2,-1,-1,-2,3,0,...].
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CROSSREFS
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Sequence in context: A070801 A114753 A079316 this_sequence A106477 A098043 A045773
Adjacent sequences: A106478 A106479 A106480 this_sequence A106482 A106483 A106484
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), May 03 2005
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