2,3,10,15,26,()???????????????? ,简单的描述是????????????????,答案是2,3,10,15,26,(35 )


2= 1*1+1
3= 2*2-1
10=3*3+1
15=4*4-1
26=5*5+1
35=6*6-1
规律是平方加1,减1