math.CO/0409509 number 28

[rwst]

What is the conjecture

There is no $n$ such that $\forall i,j, 0<i<j<n, n>3$: $2^n + 2^i + 2^j + 1$ is composite.

See https://oeis.org/A095057 which looks positive for $n>3$.

Prerequisites needed

Status: open

Choose either option

• I plan on adding this conjecture to the repository
• This issue is up for grabs: I would like to see this conjecture added by somebody else