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A071933 a(n) = sum(i=1,n,K(i,i+1)) where K(x,y) is the Kronecker symbol (x/y). 0
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; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..79.

FORMULA

a(n) = n/4 + 0(n) asymptotically

PROG

(PARI) for(n=1, 100, print1(sum(i=1, n, kronecker(i, i+1)), ", "))

CROSSREFS

Sequence in context: A260112 A213183 A125929 * A209802 A064672 A138554

Adjacent sequences:  A071930 A071931 A071932 * A071934 A071935 A071936

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jun 14 2002

STATUS

approved

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Last modified February 21 15:11 EST 2019. Contains 320374 sequences. (Running on oeis4.)