Questions tagged [power-towers]

For questions pertaining to power towers: expressions like a^(b^(c^d))), which result from iterated exponentiation. The "hyperoperation" tag may be appropriate, too.

134 questions
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Summation of :$\sum_{n=2}^{\infty} \frac{nx^n}{\ln(n)}$ [closed]

Can anyone help me to compute this Sum: $$\sum_{n=2}^{\infty} \frac{nx^n}{\ln(n)}$$ ; thank you..
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Power Towers, and Notation for Iterated Exponentiation

So far, we use the symbol $$\sum$$ to denote sums, and $$\prod$$ to denote products. But is there any such notation for exponentiation? Has any research been done about exponentiation of this type, ...
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Identify the base and exponent in $x^{x^x}$ in order to apply power rule of differentiation

While differentiating ${x}^{{x}^{x}}$ using power rule, what should be the base and exponent, i.e. base=$x$, exponent=$x^x$ or base=$x^x$, exponent=$x$. Any WHY?
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Is $a^x\equiv x\mod 10^n$ always uniquely soveable, when $\gcd(a,10)=1$?

If $\gcd(a,10)=1$ and $n\ge 1$, is the equation $$a^x\equiv x\mod 10^n$$ always uniquely solveable modulo $10^n$ ? If yes, how can this be proven ? The discrete logarithm does not seem to help. I ...
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Tetration with 0 < #s < 1?

When I try numbers between 0 and 1 on my calculator app n-calc on my phone .. I get rapid convergence when the numbers are close to 1 .. And alternating but slow convergence when numbers are close to ...
Solutions of $a^{a^x}=x$ for fixed $a>0$
I am interested in the equation $a^{a^x}=x$ for some fixed $a>0$. Is there some way to rearrange for $x$ or solve otherwise? What about the nature of the solutions? For which fixed $a>0$ are ...