Timeline for Subset of $\mathbb N$ missing at least a class modulo each prime
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Apr 12 at 2:53 | answer | added | bof | timeline score: 9 | |
| Apr 12 at 2:53 | comment | added | Daniel Weber | The set of squares also works | |
| Apr 12 at 2:37 | review | Close votes | |||
| Apr 18 at 3:02 | |||||
| Apr 12 at 2:29 | comment | added | Nick S | Not a direct answer to this problem, but the square free integers $S$ have the property that $$ \mathrm{Card}(S \pmod p^2)=p^2-1$$ for all primes $p$. Moreover, if I am not mistaken, a set $X$ belongs to the dynamical system generated by $S$ exactly when $$\mathrm{Card}(S \pmod p^2)<p^2$$ for all primes, and I find this last bit very interesting. | |
| Apr 12 at 2:27 | history | edited | joaopa | CC BY-SA 4.0 |
edited body
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| Apr 12 at 2:14 | comment | added | mathworker21 | $S := \{(2n)! : n \in \mathbb{N}\}$ | |
| Apr 12 at 2:02 | history | asked | joaopa | CC BY-SA 4.0 |