2009/12/11
a * (a - 2) + 1 == (a - 1) * (a - 1) == a * a - 2 * a + 1
......
2 * 0 + 1 == 1 * 1 == 2 * 2 - 2 * 2 + 1
3 * 1 + 1 == 2 * 2 == 3 * 3 - 2 * 3 + 1
4 * 2 + 1 == 3 * 3 == 4 * 4 - 2 * 4 + 1
5 * 3 + 1 == 4 * 4 == 5 * 5 - 2 * 5 + 1
6 * 4 + 1 == 5 * 5 == 6 * 6 - 2 * 6 + 1
7 * 5 + 1 == 6 * 6 == 7 * 7 - 2 * 7 + 1
8 * 6 + 1 == 7 * 7 == 8 * 8 - 2 * 8 + 1
9 * 7 + 1 == 8 * 8 == 9 * 9 - 2 * 9 + 1
......

2005/09/18
ゴミ掃除、リセット。