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A063951
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Of course every number is the sum of 4 squares; these are the odd numbers such that the first square can be taken to be any positive square < n.
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1
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1, 3, 5, 7, 9, 13, 15, 17, 21, 25, 33, 41, 45, 49, 57, 65, 73, 81, 89, 97, 105, 129, 145, 153, 169, 177, 185, 201, 209, 217, 225, 257, 273, 297, 305, 313, 329, 345, 353, 385, 425, 433, 441, 481, 513, 561, 585, 609, 689, 697, 713, 817, 825, 945
(list; graph; refs; listen; history; internal format)
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