Medium
Tobias sent a chain letter to his friends, asking them to forward the letter to more friends. The number of people who receive the email increases by a factor of 4 every weeks, and can be modeled by a function, , which depends on the amount of time, (in weeks). Tobias initially sent the chain letter to 37 friends.
Write a function that models the number of people who receive the email t weeks since Tobias initially sent the chain letter.
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