Primes of the form 80*R_k + 7, where R_k is the repunit (A002275) of length k.
A093171
Primes of the form 80*R_k + 7, where R_k is the repunit (A002275) of length k.
Terms
- a(0) =7a(1) =887a(2) =8887a(3) =888887a(4) =888888887a(5) =888888888887
External references
- oeis: A093171