Primes of the form 9*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
A093944
Primes of the form 9*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
Terms
- a(0) =97a(1) =977a(2) =97777
External references
- oeis: A093944
A093944
Primes of the form 9*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.