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Search: id:A118230
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| A118230 |
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Column 3 of triangle A118229, starting with row 1 to include leading zeros. |
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+0
2
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| 0, 0, 1, -1, 0, 0, -1, 2, 0, -1, 1, -1, -2, 1, 1, 0, 2, -2, -1, 0, 0, 1, 1, -1, -4, 2, 1, 1, 0, 0, 1, 0, 2, -6, 3, 0, -6, 7, 1, -2, 8, -8, -5, -5, -2, 12, 3, -7, -6, -9, 1, 18, 6, -21, -9, -5, 4, 25, -1, 1, 2, -39, -1, 35, 0, 3, 3, -18, -22, 37, 5, -5, 8, -48, 9, 45, -10, -4, 5, -55, 10, 40, -17, -35, 4, -2, -11, 61, 4, -13
(list; graph; listen)
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OFFSET
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1,8
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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FORMULA
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Sum_{k=1..n, gcd(n,k)=1} a(k) = 1 when n=4, 0 elsewhere.
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PROGRAM
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(PARI) {a(n)=(matrix(n+2, n+2, r, c, if(r>=c, if(gcd(r-c+1, c)==1, 1, 0)))^-1)[n, 3]}
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CROSSREFS
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Cf. A118229.
Sequence in context: A099494 A030341 A121444 this_sequence A153246 A025889 A126306
Adjacent sequences: A118227 A118228 A118229 this_sequence A118231 A118232 A118233
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KEYWORD
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sign
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AUTHOR
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Leroy Quet, Paul D. Hanna (pauldhanna(AT)juno.com), Apr 16 2006
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