Convergence in p-adics and reals
If you have $|a|>1$ in $K=\Bbb Q_p$ or $\Bbb R$ and also $|a|<1$ in $L=\Bbb Q_p$ or $\Bbb R$ then $1/(1-a^n)\to0$ in $K$ but $1/(1-a^n)\to1$ in $L$. So, can you find $a$ with $|a|>1$ in $\Bbb Q_2$ and $|a|<1$ in $\Bbb Q_3$ and $\Bbb R$?
Given finitely many primes $p_1,\ldots, p_m$, there do exist sequences $(x_n)$ in $\Bbb Q$ such that $x_n\to 0$ in $\Bbb Q_{p_i}$ for $1\le i\le m$, but $x_n\to 1$ in $\Bbb R$. Indeed, just let $$x_n=\frac{A^n}{A^n-1}$$ where $A=p_1p_2\cdots p_m$.
Likewise, there do exist sequences $(x_n)$ in $\Bbb Q$ such that $x_n\to 0$ in $\Bbb Q_{p_i}$ for $2\le i\le n$ and $x_n\to0$ in $\Bbb R$, but $x_n\to 1$ in $\Bbb Q_{p_1}$: Let $B=p_2p_3\cdots p_m$. Find $k\in\Bbb N$ with $B^k>p_1$and let $$y_n=\frac{B^{kn}}{B^{kn}-p_1^n}.$$ Then automatically $\operatorname{ord}_{p_i}(y_n)=kn\to \infty$ for $2\le i\le m$ and $\operatorname{ord}_{p_1}(y_n-1)=n\to \infty$. But how can we fix the limit in $\Bbb R$? For each integer $N$, there exist infinitely many primes that are $\equiv 1\pmod N$, hence we can pick $q_n$ such that $q_n$ is prime and $q_n\equiv 1\pmod{p_1^nB^{kn}}$. Then automatically $q_n>B^{kn}$. Now let $$ x_n=\frac{y_n}{q_n}.$$ As $q_n\to 1$ in $\Bbb Q_{p_i}$ for $1\le i\le n$, the limits of $(x_n)$ are the same as the limits of $(y_n)$ in the $\Bbb Q_{p_i}$, $1\le i\le m$. And as $0<x_n<\frac1{B^{kn}-p_1^n}=\frac1{(B^k-p_1)(B^{k(n-1)}+\ldots+p_1^{n-1})}<\frac1{B^{k(n-1)}}$, we also have $x_n\to 0$ in $\Bbb R$ as desired.
Remark: By using linear combinations of the above, we conclude that it is possible to prescribe a (rational) limit for any finite collection of places (i.e., $p$-adic valuations and/or the reals)