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Yes. Sum of powers of 2 from 20 to 2n is (2(n + 1) - 1) or (2 x 2n) -1

So sum of 1 + 2...+ 4096 is 8192 - 1 ie 8191.

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Q: Is there a trick for calculating a sequence such as 1 plus 2 plus 4 plus 8 plus 16 plus 32 plus 64 all the way through to 4096 please?
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