A=1+1/2+1/3+1/4+1/5+……+1/15+1/16
=1+(1/2+1/3+1/6)+(1/9+1/11+1/12+1/13)+(1/7+1/14)+(1/5+1/10+1/15)+(1/4+1/8+1/16)
=2+(1/9+1/11+1/12+1/13)+3/14+6/15+7/16
而4/13<1/9+1/11+1/12+1/13<4/9
1=16/16<3/14+6/15+7/16<16/14=8/7
所以1+4/13<(1/9+1/11+1/12+1/13)+3/14+6/15+7/16<4/9+8/7=1+37/63
所以3+4/13<2+(1/9+1/11+1/12+1/13)+3/14+6/15+7/16<3+37/63
即3+4/13<A<3+37/63,A的整数部分是3
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