做字符串的时候上网搜的,实用性未知。
一千以下:
61,83,113,151,211
一万以下:
1217,1627,2179,2909,3881,6907,9209
十万以下:
12281,13331,16381,21841,29123,38833,51787,69061,92083
百万以下:
122777,163729,218357,291143,388211,517619,690163,999983
千万以下:
1226959,1635947,2181271,2908361,3877817,5170427,6893911,9191891
一亿以下:
12255871,16341163,21788233,29050993,38734667,51646229,68861641,91815541
十亿左右:
1e9+7,1e9+9
十亿以下:
122420729,163227661,217636919,290182597,386910137,515880193,687840301,917120411
十亿以上:
1222827239,1610612741,3221225473ul,4294967291ul