id:A087620 - OEIS Search Results

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#{0<=k<=n: kn is divisible by 4}.

+0
2

1, 1, 2, 1, 5, 2, 4, 2, 9, 3, 6, 3, 13, 4, 8, 4, 17, 5, 10, 5, 21, 6, 12, 6, 25, 7, 14, 7, 29, 8, 16, 8, 33, 9, 18, 9, 37, 10, 20, 10, 41, 11, 22, 11, 45, 12, 24, 12, 49, 13, 26, 13, 53, 14, 28, 14, 57, 15, 30, 15, 61, 16, 32, 16, 65, 17, 34, 17, 69, 18, 36, 18, 73, 19, 38, 19, 77, 20 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`With the similar remainder 1, 2 and 3 sequences provides a four-fold partition of A000027.`
	FORMULA	`a(n)=sum{k=0..n, if (mod(kn, 4)=0, 1, 0) }`
	CROSSREFS	`Cf. A077814, A087507, A026741.` `Sequence in context: A144019 A085045 A093664 this_sequence A142721 A152992 A070951` `Adjacent sequences: A087617 A087618 A087619 this_sequence A087621 A087622 A087623`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 13 2003`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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