A025345 Numbers that are the sum of 3 distinct nonzero squares in exactly 7 ways.

341, 461, 494, 506, 509, 521, 545, 549, 566, 569, 581, 654, 666, 677, 797, 801, 806, 809, 821, 857, 893, 894, 899, 906, 953, 954, 971, 981, 1014, 1050, 1069, 1074, 1086, 1098, 1101, 1133, 1139, 1174, 1194, 1211, 1217, 1249, 1259, 1266, 1294, 1298, 1364, 1374