Convert recursive function into a for loop and while loop [Python]

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I need to convert

def aRecursive(n):
 if n is 1:
 return 3
 else:
 return 2 * aRecursive(n-1) + 5

into a for loop and a while loop. I can't seem to wrap my mind around the process. The original function for these loops are:

a(1) = 3
a(n) = 2 * a(n-1) + 5

An answer and explanation would help out immensely.

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