What is the 4th number in the Powers of 2 sequence starting with 1?

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Q1.

What is the sum of the first five odd numbers?

Q2.

Which of the following is the formula for the nth odd number?

Q3.

What is the next number in the sequence 1, 4, 9, 16?

Q4.

If the first five hexagonal numbers are 1, 6, 15, 28, 45, what is the sixth hexagonal number?