Primes of the form 5*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
A093941
Primes of the form 5*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
Terms
- a(0) =5a(1) =577a(2) =577777777
External references
- oeis: A093941
A093941
Primes of the form 5*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.