数字推理1,3,9,23,53,()
问题描述:
数字推理1,3,9,23,53,()
答
1,3,9,23,53,(115)
a1=1
a2=3 = a1*2 +1
a3=9 = a2*2 +3
a4=23= a3*2 +5
a5=53= a4*2+ 7
a6=115=a5*2+ 9