A025359 Numbers that are the sum of 4 nonzero squares in exactly 3 ways.

28, 42, 55, 60, 66, 67, 73, 75, 78, 79, 85, 92, 95, 99, 109, 110, 112, 121, 125, 129, 134, 137, 161, 164, 168, 173, 179, 209, 240, 264, 312, 368, 440, 448, 536, 656, 672, 960, 1056, 1248, 1472, 1760, 1792, 2144, 2624, 2688, 3840, 4224, 4992, 5888, 7040, 7168

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..68
• Eric Weisstein's World of Mathematics, Square Number
• Index entries for sequences related to sums of squares

Crossrefs

Cf. A025368 (at least 3 ways).

Formula

{n: A025428(n) = 3}. - R. J. Mathar, Jun 15 2018