id:A124896 - OEIS Search Results

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Number of squarefree numbers of the form n^2 + k^2, 1<=k<=n.

+0
2

1, 1, 2, 1, 4, 2, 5, 4, 6, 4, 9, 3, 11, 6, 7, 7, 14, 5, 16, 8, 11, 8, 19, 7, 20, 11, 16, 12, 24, 8, 26, 15, 18, 15, 23, 11, 33, 16, 21, 15, 34, 10, 38, 19, 23, 20, 41, 15, 38, 19, 29, 22, 46, 15, 38, 22, 33, 26, 53, 15, 52, 26, 32, 30, 48, 18, 59, 30, 40, 22, 62, 21, 64, 32, 39, 34 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = Sum(A008966(A070216(n,k)):1<=k<=n) = Sum(ABS(A124895(n,k)):1<=k<=n).` `0 < a(n) <= n-1.`
	CROSSREFS	`Sequence in context: A054269 A086450 A106044 this_sequence A008742 A029136 A001479` `Adjacent sequences: A124893 A124894 A124895 this_sequence A124897 A124898 A124899`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 12 2006`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

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