142857 (number)

1 × 142,857 = 142,857
2 × 142,857 = 285,714
3 × 142,857 = 428,571
4 × 142,857 = 571,428
5 × 142,857 = 714,285
6 × 142,857 = 857,142
7 × 142,857 = 999,999 (= 142857 + 857142)
9/7      =1.2857142857142857142857142857143
99/7    =14.142857142857142857142857142857
999/7  =142.71428571428571428571428571429
9999/7=1428.4285714285714285714285714286
Ref: https://en.wikipedia.org/wiki/142857_(number)

123456789*9  =1111111101
123456789*18=2222222202

123456789*243=29999999727
123456789*108=13333333212

 柯斯特利金的优秀教材《代数学引论》
Alexei I Kostrikin （1929～2000）. 1929年2月生于大莫雷斯。1952年毕业于莫斯科大学数学力学系，1959年获数理科学博士学位。1972年任莫斯科大学高等代数
《拓扑与几何》  是2008年1月1日出版 作者是(美国)Bredon布里登  

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