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Đây có phải là số Loeschian?
Số nguyên dương klà số Loeschian nếu kcó thể được biểu thị như i*i + j*j + i*jcho i, jsố nguyên. Ví dụ: các số Loeschian dương đầu tiên là: 1( i=1, j=0); 3( i=j=1); 4( i=2, j=0); 7( i=2, j=1); 9( i=-3, j=3); ... Lưu ý rằng i, jđối …
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