Numbers of form x^2 + y^2 + 7z^2. 0, 1, 2, 4, 5, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 20, 23, 24, 25, 26, 27, 28, 29, 30
1 seqfan posts