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A124966 Numbers which can be expressed as the ordered sum of 3 squares in 2 or more different ways. 5
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; refs; listen; history; internal format)
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 * A192049 A133246 A190151

Adjacent sequences:  A124963 A124964 A124965 * 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 February 17 22:48 EST 2012. Contains 206085 sequences.