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A071932
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a(n) = 4*sum(i=1,n,K(i,i+1)) - n where K(x,y) is the Kronecker symbol (x/y).
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0
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1, 4, 7, 2, 5, 8, 11, 6, 1, 4, 7, 2, 5, 8, 11, 6, 9, 12, 15, 10, 5, 8, 11, 6, 1, 4, 7, 2, 5, 8, 11, 6, 9, 12, 15, 10, 13, 16, 19, 14, 9, 12, 15, 10, 5, 8, 11, 6, 9, 12, 15, 10, 5, 8, 11, 6, 1, 4, 7, 2, 5, 8, 11, 6, 9, 12, 15, 10, 13, 16, 19, 14, 9, 12, 15, 10, 13, 16, 19, 14, 17, 20, 23
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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COMMENTS
| a(n)>0 for n>2 and it seems that a(n)/Log(n) is bounded : a(n)< 4*Log(n) for n large enough. Does lim a(n)/Log(n) exist ?
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PROG
| (PARI) for(n=3, 100, print1(4*sum(i=1, n, kronecker(i, i+1))-n, ", "))
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CROSSREFS
| Sequence in context: A164106 A159895 A113963 * A139348 A021683 A194160
Adjacent sequences: A071929 A071930 A071931 * A071933 A071934 A071935
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 14 2002
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