| 1, 2, 3, 5, 6, 9, 11, 14, 16, 21, 23, 29, 32, 36, 40, 48, 51, 60, 64, 70, 75, 86, 90, 100, 106, 115, 121, 135, 139, 154, 162, 172, 180, 192, 198, 216, 225, 237, 245, 265, 271, 292, 302, 314, 325, 348, 356, 377, 387, 403, 415, 441, 450, 470, 482
(list; graph; listen)
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OFFSET
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2,2
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COMMENT
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a(n) = |{(x,y) : 1<=x<=y<=n, x+y<=n, 1 = gcd(x,y)}| = |{(x,y) : 1<=x<=y<=n, x+y>n, 1 = gcd(x,y)}|. - Steven Butler (sbutler(AT)math.ucsd.edu), Mar 31 2006
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CROSSREFS
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Partial sums of A023022.
Sequence in context: A026168 A113238 A104214 this_sequence A102825 A070991 A008747
Adjacent sequences: A046654 A046655 A046656 this_sequence A046658 A046659 A046660
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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