# 循环数

142857 × 1 = 142857
142857 × 2 = 285714
142857 × 3 = 428571
142857 × 4 = 571428
142857 × 5 = 714285
142857 × 6 = 857142

142857 × 7 = 999999

${\displaystyle {1 \over 7}=0.{\overline {142857}}}$
${\displaystyle {2 \over 7}=0.{\overline {285714}}}$
${\displaystyle {3 \over 7}=0.{\overline {428571}}}$
${\displaystyle {4 \over 7}=0.{\overline {571428}}}$
${\displaystyle {5 \over 7}=0.{\overline {714285}}}$
${\displaystyle {6 \over 7}=0.{\overline {857142}}}$

## 参考文献

1. ^ Cyclic Number. Wolfram MathWorld.