Please solve these problems for me!Please please please

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Please solve these problems for me!Please please please
NON-SQUARES
The numbers 1,4,9,16,25,36,49,64,81,… are called the square numbers.
Let’s call the omitted numbers 2,3,5,6,7,8,10,11,12,13,...the non-square numbers.
The first non-square number is 2
The second non-square number is 3.
The third non-square number is 5.
a) What is the twentieth non-square number?
b) How many two-digit non-square numbers are there?
c) What is the hundredth non-square number?
d) The nth square number is given by the formula n^2 (that is,n raised to the second power).Find a formula for the nth non-square number.

问题不是太懂,但我知道n与n-1之间有2（n-1）个非完全平方数

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