Last edited by hbghlyj 2023-9-13 08:20[1,3,4,6,7,9,11,12,14,15,16,19,21,22,23,24,27,28,
30,31,33,35,36,38,39,42,43,44,46,47,48,49,51,54,
55,56,57,59,60,62,63,64,66,67,69,70,71,75,76,77,
78,79,81,83,84,86,87,88,91,92,93,94,95,96,99,102,
103,105,107,108,110] A018825 Numbers that are not the sum of 2 nonzero squares. 例如$77|a^2+b^2\iff77|a^2$ 且 $77|b^2$ |