1,3,7,13,21,31,43,57,

1,3,7,13,21,31,43,57,


1+2=3
3+4=7
7+6=13
13+8+21
.
57+16 = 73



1,3,7,13,21,31,43,( )


1,3,7,13,21,31,43,(57 )



What are the rules of these numbers?
Expressed by the formula containing n-


1.3.7.13.21.31.(43).(57)
The solution is that the difference between every two numbers is equal to the difference between the first two numbers plus 2, and so on. The last two blanks are 43 and 57
The nth number: n & sup2; - N + 1

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