id:A097203 - OEIS Search Results

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Number of 4-tuples (a,b,c,d) with 1 <= a <= b <= c <= d, a^2+b^2+c^2+d^2 = n and gcd(a,b,c,d) = 1.

+0
1

0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 2, 0, 1, 2, 0, 1, 2, 1, 1, 2, 1, 2, 0, 0, 3, 2, 1, 2, 1, 2, 0, 2, 2, 1, 3, 1, 2, 3, 0, 2, 4, 1, 2, 2, 1, 3, 0, 1, 3, 3, 2, 2, 4, 2, 0, 3, 2, 3, 3, 2, 3, 3, 0, 2, 5, 2, 3, 3, 2, 4, 0, 1, 5, 4, 2, 4, 2, 3, 0, 4, 4, 3 (list; graph; listen)

	OFFSET	`1,28`
	COMMENT	`The old entry with this sequence number was a duplicate of A034836.`
	LINKS	`N. J. A. Sloane and Vinay Vaishampayan, Table of n, a(n) for n = 1..1024`
	FORMULA	`If a(n) > 0 then 8 does not divide n.`
	EXAMPLE	`The solutions (if any) for n <= 20 are as follows:` `n = 1:` `n = 2:` `n = 3:` `n = 4: 1 1 1 1` `n = 5:` `n = 6:` `n = 7: 1 1 1 2` `n = 8:` `n = 9:` `n = 10: 1 1 2 2` `n = 11:` `n = 12: 1 1 1 3` `n = 13: 1 2 2 2` `n = 14:` `n = 15: 1 1 2 3` `n = 16:` `n = 17:` `n = 18: 1 2 2 3` `n = 19: 1 1 1 4` `n = 20: 1 1 3 3`
	CROSSREFS	`Sequence in context: A025678 A073189 A025855 this_sequence A025850 A096771 A129714` `Adjacent sequences: A097200 A097201 A097202 this_sequence A097204 A097205 A097206`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com) and Vinay Vaishampayan (vinay(AT)research.att.com), Oct 22 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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