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A071933
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a(n) = sum(i=1,n,K(i,i+1)) where K(x,y) is the Kronecker symbol (x/y).
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0
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1, 0, 1, 2, 3, 2, 3, 4, 5, 4, 3, 4, 5, 4, 5, 6, 7, 6, 7, 8, 9, 8, 7, 8, 9, 8, 7, 8, 9, 8, 9, 10, 11, 10, 11, 12, 13, 12, 13, 14, 15, 14, 13, 14, 15, 14, 13, 14, 15, 14, 15, 16, 17, 16, 15, 16, 17, 16, 15, 16, 17, 16, 17, 18, 19, 18, 19, 20, 21, 20, 21, 22, 23, 22, 21, 22, 23, 22, 23
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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FORMULA
| a(n) = n/4 + 0(n) asymptotically
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PROG
| (PARI) for(n=1, 100, print1(sum(i=1, n, kronecker(i, i+1)), ", "))
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CROSSREFS
| Sequence in context: A110157 A178493 A125929 * A064672 A138554 A063772
Adjacent sequences: A071930 A071931 A071932 * A071934 A071935 A071936
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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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