| viXra.org > Number Theory > viXra:2407.0143 |
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| viXra.org > Number Theory > viXra:2407.0143 |
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Number Theory |
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Authors: Theophilus Agama
Exploiting the notion of carries, we obtain improved upper bounds for the length of the shortest addition chains $iota(2^n-1)$ producing $2^n-1$. Most notably, we show that if $2^n-1$ has carries of degree at most $$kappa(2^n-1)=frac{1}{2}(iota(n)-lfloor frac{log n}{log 2}floor+sum limits_{j=1}^{lfloor frac{log n}{log 2}floor}{frac{n}{2^j}})$$ then the inequality $$iota(2^n-1)leq n+1+sum limits_{j=1}^{lfloor frac{log n}{log 2}floor}bigg({frac{n}{2^j}}-xi(n,j)bigg)+iota(n)$$ holds for all $nin mathbb{N}$ with $ngeq 4$, where $iota(cdot)$ denotes the length of the shortest addition chain producing $cdot$, ${cdot}$ denotes the fractional part of $cdot$ and where $xi(n,1):={frac{n}{2}}$ with $xi(n,2)={frac{1}{2}lfloor frac{n}{2}floor}$ and so on
Comments: 10 Pages.
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[v1] 2024-07-24 07:46:38
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