id:A072401 - OEIS Search Results

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1 iff n is of the form 4^m*(8k+7).

+0
6

0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Characteristic function of A004215, indicating numbers not the sum of 3 integer squares.`
	REFERENCES	`J.-P. Allouche and J. Shallit, The ring of k-regular sequences (Example 20), Theoretical Computer Science, 98 (1992), 163-197.`
	LINKS	`J.-P. Allouche and J. Shallit, The ring of k-regular sequences, Theoretical Computer Sci., 98 (1992), 163-197.` `Eric Weisstein's World of Mathematics, Square Numbers.` `Index entries for sequences related to sums of squares.`
	FORMULA	`a(n) = 1 - A057427(7 - A072400(n)).`
	CROSSREFS	`a(A004215(k)) = 1 for k>0, a(n) = A057427(A064873(n)), for k<112: a(n)=A064873(n), but A064873(112)=2, as also a(112 - 1) = 1.` `Cf. A071374.` `Sequence in context: A045698 A011722 A044938 this_sequence A064873 A037823 A115790` `Adjacent sequences: A072398 A072399 A072400 this_sequence A072402 A072403 A072404`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 16 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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