A001944 Numbers that are the sum of 4 distinct squares: of form w^2 + x^2 + y^2 + z^2 with 0 <= w < x < y < z.

14, 21, 26, 29, 30, 35, 38, 39, 41, 42, 45, 46, 49, 50, 51, 53, 54, 56, 57, 59, 61, 62, 63, 65, 66, 69, 70, 71, 74, 75, 77, 78, 79, 81, 83, 84, 85, 86, 87, 89, 90, 91, 93, 94, 95, 98, 99, 101, 102, 104, 105, 106, 107, 109, 110, 111, 113, 114, 115, 116, 117

Offset

1,1

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Index entries for sequences related to sums of squares

Example

14 = 0^2 + 1^2 + 2^2 + 3^2.

Mathematica

nn = 20; Select[Union[Flatten[Table[a^2 + b^2 + c^2 + d^2, {a, 0, nn}, {b, a + 1, nn}, {c, b + 1, nn}, {d, c + 1, nn}]]], # <= nn^2 &] (* T. D. Noe, Aug 17 2012 *)

Crossrefs

Cf. A001974, A001983, A001948, A001995.

Sequence in context: A093994 A114985 A344703 * A024803 A004432 A025339

Adjacent sequences: A001941 A001942 A001943 * A001945 A001946 A001947

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved