A124966 Numbers which can be expressed as the ordered sum of 3 squares in 2 or more different ways.

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

Offset: 1

Author

Artur Jasinski, Nov 14 2006

Keywords

• nonn

Examples

			a(1)=9 because 9 = 3^2 + 0^2 + 0^2 or 2^2 + 2^2 + 1^2.
		

Links

• Robert Price, Table of n, a(n) for n = 1..83131

Crossrefs

Cf. A004215, A094942, A124967-A124971.

Programs

Mathematica

Select[Range[129], Length@PowersRepresentations[#, 3, 2] >= 2 &] (* Ray Chandler, Oct 31 2019 *)

Formula

Equals = A000027 - A094942 - A004215.

Extensions

Corrected and extended by Ray Chandler, Nov 30 2006