id:A124966 - OEIS Search Results

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Numbers which can be expressed as the ordered sum of 3 squares in 2 or more different ways.

+0
6

9, 17, 18, 25, 26, 27, 29, 33, 34, 36, 38, 41, 45, 49, 50, 51, 53, 54, 57, 59, 61, 62, 65, 66, 68, 69, 72, 73, 74, 75, 77, 81, 82, 83, 85, 86, 89, 90, 94, 97, 98, 99, 100, 101, 102, 104, 105, 106, 107, 108, 109, 110, 113, 114, 116, 117, 118, 121, 122, 123, 125, 126, 129 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`Equals = A000027 - A094942 - A004215.`
	EXAMPLE	`a(1)=9 because 9=3^2+0^2+0^2 or 2^2+2^2+1^2`
	MATHEMATICA	Needs["NumberTheory`NumberTheoryFunctions`"]; Select[Range[130], Length @ OrderedSumOfSquaresRepresentations[3, # ] >= 2 &] (Chandler)
	CROSSREFS	`Cf. A004215, A094942, A124967-A124971.` `Sequence in context: A103707 A004751 A134104 this_sequence A133246 A144752 A073160` `Adjacent sequences: A124963 A124964 A124965 this_sequence A124967 A124968 A124969`
	KEYWORD	`nonn`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Nov 14 2006`
	EXTENSIONS	`Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 30 2006`

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

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