Numbers n that are primitive solutions to n^2 = a^2 + b^2 + c^2 (a,b,c > 0). 3, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51
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