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A096397 a(n) = #{ 1<=i<=n : k(n,i)=-1 } where k(n,i) is the Kronecker symbol. 4
0, 0, 1, 0, 2, 0, 1, 2, 0, 1, 4, 2, 6, 1, 1, 0, 8, 3, 8, 4, 6, 4, 8, 4, 0, 3, 9, 6, 14, 2, 9, 8, 10, 6, 10, 0, 18, 6, 6, 8, 20, 4, 21, 10, 12, 9, 18, 8, 0, 9, 14, 12, 26, 8, 11, 12, 18, 13, 26, 8, 30, 11, 17, 0, 24, 6, 34, 16, 22, 10, 28, 12, 36, 13, 18, 18, 30, 10, 28, 16, 0, 18, 39, 12, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

a(A096398(n)) = 0; a(n) = A000010(n) - A096396(n) = A096396(n) - A071961(n). [Reinhard Zumkeller, Mar 24 2012]

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(PARI) a(n)=sum(i=1, n, if(kronecker(n, i)+1, 0, 1))

CROSSREFS

Cf. A000010, A051953.

Sequence in context: A283304 A058685 A029300 * A103919 A263234 A264394

Adjacent sequences:  A096394 A096395 A096396 * A096398 A096399 A096400

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Aug 06 2004

STATUS

approved

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Last modified March 27 08:52 EDT 2017. Contains 284146 sequences.