Primes of the form 7*10^k + 3*R_k, where R_k is the repunit (A002275) of length k.
A093675
Primes of the form 7*10^k + 3*R_k, where R_k is the repunit (A002275) of length k.
Terms
- a(0) =7a(1) =73a(2) =733a(3) =7333a(4) =733333
External references
- oeis: A093675