A sequence cannot be defined by one number. At least, not a sequence of any value.
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what is the recursive formula for this geometric sequence?
If you allow decimals and fractions, there's no answer. If you're only interested in whole numbers ... the "counting " numbers ... then it's 136101522.
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.