Challenge: sum of squares. Let's break 299

[Allen]

len 487:(461, 439, 402, 327, 457, 443, 398, 331, 453, 447, 337, 392, 449, 451, 333, 396, 445, 455, 329, 400, 441, 459, 325, 404, 437, 463, 378, 406, 435, 465, 376, 408, 433, 467, 374, 410, 431, 469, 372, 412, 429, 471, 258, 226, 450, 391, 338, 446, 454, 387, 342, 442, 458, 326, 403, 438, 462, 379, 405, 324, 460, 440, 401, 328, 456, 444, 340, 336, 393, 448, 452, 332, 293, 436, 464, 377, 407, 434, 466, 375, 409, 432, 468, 373, 411, 430, 470, 371, 413, 428, 472, 369, 415, 485, 476, 365, 364, 477, 484, 416, 368, 473, 427, 414, 486, 475, 366, 363, 421, 420, 480, 361, 423, 418, 482, 479, 362, 422, 478, 483, 417, 367, 474, 487, 242, 383, 346, 330, 295, 381, 348, 277, 399, 385, 291, 334, 395, 389, 236, 248, 481, 419, 257, 227, 349, 380, 296, 280, 345, 384, 241, 288, 388, 341, 335, 290, 386, 343, 282, 294, 382, 347, 278, 298, 231, 394, 390, 339, 237, 292, 284, 200, 425, 304, 272, 353, 323, 302, 274, 351, 225, 259, 270, 306, 370, 359, 266, 263, 313, 312, 264, 265, 360, 424, 305, 320, 356, 269, 307, 318, 358, 426, 303, 273, 352, 224, 260, 316, 309, 267, 262, 179, 350, 275, 301, 228, 397, 279, 297, 232, 344, 281, 203, 197, 287, 289, 240, 201, 283, 246, 238, 162, 322, 354, 271, 170, 314, 311, 173, 268, 308, 317, 212, 229, 300, 276, 208, 321, 355, 221, 220, 180, 261, 315, 310, 174, 187, 254, 230, 299, 185, 256, 144, 217, 183, 178, 222, 219, 357, 319, 210, 151, 249, 235, 206, 155, 245, 239, 202, 198, 286, 243, 157, 204, 196, 128, 233, 251, 149, 175, 186, 255, 145, 216, 184, 177, 223, 218, 106, 150, 250, 234, 207, 193, 131, 125, 199, 285, 244, 156, 205, 195, 166, 123, 133, 191, 209, 152, 172, 189, 211, 113, 176, 148, 252, 109, 215, 146, 110, 214, 147, 253, 188, 136, 120, 169, 192, 132, 124, 165, 159, 130, 126, 163, 161, 95, 194, 167, 122, 134, 190, 171, 153, 247, 114, 82, 143, 181, 108, 88, 168, 121, 104, 92, 164, 160, 129, 127, 98, 158, 67, 102, 154, 135, 90, 79, 117, 139, 86, 83, 142, 182, 107, 89, 80, 116, 140, 85, 111, 213, 76, 93, 103, 66, 78, 118, 138, 87, 57, 112, 84, 141, 115, 54, 27, 94, 75, 69, 100, 96, 73, 71, 50, 119, 137, 32, 49, 72, 97, 99, 70, 51, 30, 91, 105, 64, 36, 28, 53, 68, 101, 43, 38, 62, 59, 41, 40, 81, 63, 37, 44, 77, 23, 58, 42, 39, 25, 56, 65, 35, 46, 18, 31, 33, 16, 48, 52, 29, 20, 61, 60, 21, 15, 10, 26, 74, 47, 34, 2, 7, 9, 55, 45, 4, 5, 11, 14, 22, 3, 13, 12, 24, 1, 8, 17, 19, 6)