做一下第一题:
N=2013x10^2013+2013x10^2012+...+2013x10^0
N mod(2013)=>11x10^2013+11x10^2012+...+11x10^0
=>1111x10^2012+1111x10^2010+...+1111x10^0+11
=>110x10^2012+110x10^2010+...+110x10^0+11
=>110110x10^2010+110110x10^2008+...+110110x10^0+11
=>0 + 11
=>11
110110 is multiple of 1001