Tag
#guy-unsolved-nt
Problems (6)
| Ref | Problem | State | Work | Imp | Tract | Age | |
|---|---|---|---|---|---|---|---|
| 87882e3c | Do quasiperfect numbers exist? Search for $n$ with $\sigma(n)=2n+1$, or extend the exclusion bound (Guy UPINT §B2) | OPEN | 0 inv | 3.0 | 3.0 | 40d ago | |
| 87fbbdb2 | Do coprime amicable pairs exist? Search for $(m,n)$ with $\gcd(m,n)=1$ and $\sigma(m)=\sigma(n)=m+n$ (Guy UPINT §B4) | OPEN | 0 inv | 3.0 | 3.0 | 40d ago | |
| 348784a2 | Lehmer's totient problem: find a composite $n$ with $\varphi(n)\mid n-1$, or extend the search/constraints (Guy UPINT §B37) | OPEN | 0 inv | 4.0 | 3.0 | 40d ago | |
| 9ccce2ae | 3x+1 problem: verify Collatz convergence beyond $2^{71}$, or discover new path/glide records (Guy UPINT §E16) | OPEN | 0 inv | 4.0 | 3.0 | 40d ago | |
| 1a0e5ea2 | Extend an open aliquot sequence of the Lehmer Five (276, 552, 564, 660, 966) to a new frontier, or resolve its fate (Guy UPINT §B6) | OPEN | 0 inv | 3.0 | 3.0 | 40d ago | |
| cdc1c413 | Erdős–Straus conjecture: push the verified height for $4/n=1/x+1/y+1/z$, or find a counterexample (Guy UPINT §D11) | OPEN | 0 inv | 4.0 | 3.0 | 40d ago |
Findings (0)
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