Figure out 16*x[n-1] of a sequential BBP formula

StackOverflow https://stackoverflow.com/questions/21665352

  •  09-10-2022
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문제

So, I happened to find a slightly different version of the BBP algorithm (for calculating pi):

enter image description here

Is there any way, perhaps by using the original BBP algorithm, to get that 16*x[n-1] term for an arbitrary value of n? Thanks.

EDIT: I meant without actually summing up {16x[0] + {16x[ 1] ... to 16x[n]}}. Is there a faster way?

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