Since the difference between each term is '4' , then the first part of the formula is '4n'.
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what is the recursive formula for this geometric sequence?
A sequence cannot be defined by one number. At least, not a sequence of any value.
There is no formula for prime numbers. They form a random sequence.
multiplies by 2
un = u0*rn for n = 1,2,3, ... where r is the constant multiple.